Wouldn’t the flaw in this logic be that Hellcaller specifically refers to Destro abilities, and Soul Harvester is gonna be Afflic/Demo?
I mean granted, to go down the rabbit hole, it’d be red herrings and they’d just change which ability triggered what, so fair enough, though if Hellcaller was just Soul Harvester? I’d ALSO be disappointed.
I expect Soul Harvester to interact with Drain Soul, maybe the old Reap Soul ability Affliction had in Legion, and its Demo-half is getting more Demonic Cores from your demon minions or something.