Great intro, Brassman. Not only is it well presented but it shows a clear understanding of some of the archetype's subtleties.
I can contribute the observation that Inferno Titan is in the spotlight because of his broad strength against creatures and particularly token + planeswalker strategies (including the underwhelming but very fashionable "Baby" Jace). He appeared on occasion as a supporting actor in a few "Odd Oath" builds in the past, a few of Josh Potucek's Oathstill lists, and I tested him in a non-Oath deck a few years back with Caverns and Trinket Mages called "Inferno Bomberman." I learned from Dragonlord Salvagers Oath that the particulars of that approach begged the question, "Yes it's good, but what does it lose to?" And the most common answer was Jace, the Mind Sculptor in tandem with Swords to Plowshares. Not the Containment Priest, not combo, not Dredge or other traditionally sketchy weak points for some Oath lists. We could always succesfully force the Oath (since it's relatively easy to resolve compared to most things and because Priests could be Sudden Shocked etc.) but horrifically, this set up could end up losing after activating Oath of Druids multiple times, which is disheartening. The Inferno Titan was a way to make sure that there would always be value even if one of the Titans was dispatched to the farms.
By contrast, Auriok lists shine more against combo and Dredge. The current iteration of Inferno Oath can handle Dredge by giving it serious attention; Auriok Oath can get away with less hate since Auriok himself is a form of Dredge control (recurring Crypts, Spellbombs etc.) If there is a meta shift towards combo, a lax in the Stony Silence/Null Rod saturation (which we can start to see now), and Dredge rises, Auriok can return. Dromoka will return from Tarkir if/when Xerox and Landstill move from predominantly Tundra based to predominantly Volcanic Island based as they have in the past; she terrorizes Delvers and Bolts cannot halt her majesty but she dislikes farming and the road to exile.
Other reasons I went with Inferno Titans and the supporting cast v. Auriok are that I wanted a cleaner mana base, I did not want to run Engineered Explosives (weaker v. Delver/Pyro now due to CMC changes and Shops is too aggressive for the old EE @ 2 blowout plays), and at Champs I felt some of the residual paranoia about Paradoxical Outcome would lead to a more Null Rod heavy environment, which it did. This is starting to fade but it's still present.