At first I used to be saying it as a joke
But when the shadow was revealed to be Zunisha's I remembered a theory about Tama's df being what caused Zunisha's punition
So yeah, at this point I'm 90% sure it's Tama's fruit
Oda usually gives ridiculously broken abilities to fodder
Shirahoshi, sugar, momo, perona etc....
So I wouldn't be surprised if Tama's devil fruit awakening is what the Gorosei is talking about