Personal wank honestly started when they began getting focus with Shanks and he "respected" them.
In hindsight the heinous presence of Saturn REALLY is starting to further drive me into thinking Shanks isnt all that great of a person.
But it recently started with the Sabo flashback for sure. Thats when it convinced me Imu was the FV, because not only do the Gorosei seem to be powerful, but they have God Knights with them to, which at this point seems to account for the largest faction of major named characters by far.
Doflamingo, Kaido, Shanks, Akainu, Blackbeard, etc all generally have 10-11 main people on their side. Imu seems to have like 15 at least.