So While I still see it being doubtful that 6v6 ever comes back, if it were to happen, what combos do you see becoming a thing? Ult combo or otherwise.
Personally I can see Zarya Grav leading into a Nemesis Form Ram being dangerous but struggling to think of others where they’d synergize well
Not sure how effective itd be but Grav rnding just to be stuck in place because of Mauga would be funny
Imagine cage grav lol… that would be hilariously unnecessary but funny.
If we’re just talking in terms of base kit synergy, I imagine Sigma + Ram would work well. Sigma would enable Ram poke. Ram can fill in any gaps for Sigma, plus act as a bodyguard with Nem. Alternatively, Sig can cover any bases while Ram does his best to rush in there and punch things up a storm. Sig’d be useful against the likes of Mauga and Ana in that respect.
As far as ult combos go? I can imagine some good ones, but I don’t think they’d be crazy, insane, auto-win combos.
For example, a Grav+JQ ult would be killer, but it could still be messed up by suzu or a LW. Ram’s ult is good, but it’s more of a slow burn than a BFG blast.
I think out of the OW2 tanks specifically, it’d be something like Cage+D.Va nuke or Cage+Terra Surge. Using many other resources along with Mauga’s ult can actually be overkill and a bit of a waste, so dropping ults that otherwise aren’t a big deal makes more sense than overkilling with Cage+Flux. Imo.
grav rampage would be insane, you could see big lucio beat moments again and ult economy wars, where reaction time and coordination matters. people playing well would be noticeable again, not like now, where people can just go incognito and hide between their tank getting counterswapped. “Huh? Why are we losing our tank is azz… etc. etc.”
Ball/Doom is a crazy combo. Add a good Genji and a decent Tracer to the mix, season it with a little Kiriko and Lucio and you have a fantastic recipe for homemade cancer.
Orisa/Rein, JQ/Zarya, JQ/Rein, Winston/Doomfist
Orisa Rein is busted strong, just shatter as Orisa ults, and anyone inside is screwed.
ooooh I hadn’t even thought of Orisa Rein, my mind defaulted to “orisa has supercharger in 6v6”
Ram + sig so that not only will they be held still, they get slammed
Just old dive comp.
Knock back resistance, and no consistent hard stuns from brig. Means their is really nothing stopping you from just picking a DPS or a support like or zen. And just mowing them down under a winston barrier while having DM on them at the same time, keeping them from doing anything other then Melee hits against you.
EMP to shut down enemy tanks like like mauga/ram/zarya and more.
And honestly I’m pretty sure theirs nothing most comps can do to it with setup.
Sombra should be unviable, except when Widowmaker and/or Ball+Doom is on the other team. Then she should get a boost in stats just because. Manipulate her hero stats based on the enemy comp. 
Imagine Mauga + Queen.
Mauga activates HAHA
Queen is within the radius and swings her axe
"How are our bullets healing them!?"
Old orisa flankhardt pull combo with bap was an awesome and niche strategy. Poke phase my Orisa would pull people for me to get massive amounts of ult charge with firestrike. then they would play main, taunting the enemies while I was on the flank, as soon as they pulled a group of people I would come from around the corner or pin a squishy and cleave through the enemies as well as having the ability to pull firestrike through window. we usually had a genji brawling or flanking with me, dashing through the pulls and a mei to protect the orisa and catch people off guard. man that was awesome. And it was actually pretty decent against textbook double shield/bunker comps.
The only major issue I could see popping up from 6v6 tank combos is Rein, JQ, Lucio causing a rundown meta.
Would it really be an issue that couldnt be fought? Iunno, but rundown is strong enough now even without having a shield and double speed boosts.
But obviously since JQ would have like 350-400 HP and rein would be back down to 500 most likely they would both be quite killable again so perhaps rundown wouldnt be so bad when the biggest threats are actually allowed to die
If we’re talking about Tank ult combos, then Mauga + Doom or Mauga + Ball could be pretty dangerous.
This is also a map problematic. In the current state of maps, it looks like brawl and rush would win if we went to 6v6. This is even a problem in 5v5, thus why you see a lot of rush comps including the flavour of the month tank, in high elo and pro play(except asia). 6v6 would need more map variety in terms of high ground, sightline ranges, flanks and small cover instead of hard choke points. we don’t want to repeat what 2CP screwed in OW1. I’d advocate for more maps for any gamemode except push, because the ladder forces maps that are more favourable to rush. Or what if they made a push map with a flying bot, where the path would lead around multiple highgrounds. Interesting thought…
dva bomb inside mauga ult.
It was map problematic when 6v6 turned into 5v5, but the good news is there is significantly fewer 5v5 specific maps than the OG 6v6 ones. It is probably STILL less work to fix the existing 5v5 maps for 6v6 than to continue addressing the 6v6 maps for 5v5.
And verticality isnt an issue in the slightest as pretty much all Overwatch 2 maps have very good verticality.
Zarya and Queen would be under rated. Bubbled Queen with her strong self sustain, with grav making instant reset on carnage swings, or rampage everyone for 225 healing over 4.5 seconds PER target.
It’d just bring goats 2.0 and with maug itd be infinitely worse