No, you won’t have a lvl 50 holy fire aura with a Dragondin, you’ll have a lvl (14+14+16=)44 holy fire aura.
That means any +skill or +fireskill does NOT increase the lvl of your Holy Fire from Dragon or Hand of Justice. Same is true for Dream, Doom, or Ice.
And yes you are correct there, those item’s WON’T increase your Skill Auras. See them more like another player aura, which sits on top of you. With 3 suchs items, you have 3 players on top of you casting an aura individually from you, but their special ability is, that they increase just their aura skill lvl and they do benefit from your synergies.
The Dragondin is nearly as good as the Shockerdin and there is very little difference.
But the Shockerdin has less resistances he has to fight against, has faster traversal speed and can be more passive.
The Dragondin has to fight more resistances, has a larger AOE with a larger conviction radius as well, but you need to charge around all the time, and he is slow in dungeons.
That’s why I recommended the Shockerdin, but overall I would always recommend the Dragondin over the Shockerdin.
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I mean, yea, maxing out Zeal and sacrifice adds like 450-500 damage (which is like 4k DPS) to a Dragondin.
If you put points into Holy Shock and resist Shock gives you more diversity, but than you rely on your merc to be near you once again, which can be really annoying.
Beyond P3 you don’t really kill with dmg auras anymore.
So going with your concept, I think a Tesladin is better suited, because more res, more flexible skill points, enigma, static and better single target damage.
But instead of Fanaticism, you run Holy fire and Highlords Wrath (30FCR is good enough).
So after a bit of testing, I think that might be the winner.
He hit’s as hard as a Tesladin with grief, but with static.
His pulse damage against cows is 619-4443.
Can farm everywhere.
And has Enigma.
Only downside 28frame for zeal instead of 24