Conventional wisdom says Sunseri, but I have a sneaking suspicion that it could be Steele just as easily.
A few nuggets that make me wonder:
Nothing has leaked overnight. If it was Sunseri, you'd think something would come from that side. At Clemson Steele's already out.
Timing of Clemson announcement is interesting - Clemson announces Steele is leaving for 'other opportunities' and then later that day UT magically has a DC? Coincidence, maybe, but maybe not.
Connections. Steele and Hart have a history. Sunseri is very close to his sons, and Vinnie is a freshman at Bama. He's said the biggest gift was to be able to coach on the same team with his son. Sure, Vinnie could transfer and that may happen, but it easier to simply not come in the first place.
The Saban factor. Nick's known as a tough negotiator and he obviously doesn't like to lose. I have to think he'll do everything he can to convince Sunseri to stay, rather than go to a conference rival who he plays every year. Plus Nick knows Kirby Smart is likely to be a HC somewhere after this next season. Sunseri is his DC-in-waiting.
In the end, who knows?