Admittedly as a UK fan 1st (alum and long time fan) and VT fan 2nd (grew up in Blacksburg), I don't see any way that UT makes any sense at all.
I love KBJ, and personally think he almost single-handedly saved the Hokies entire season this year. With JRob out, defenses clamped down on NAW, and he had trouble carrying the team on his back. KBJ stepped up big!
UT's best team in decades (maybe ever) advanced no further than VT, and will drop way off after losing 3 draft picks.
UT provides for KBJ absolutely nothing that returning to VT wouldn't.
I could understand going closer to home in Fla, but otherwise, staying at VT is the only other option that makes sense besides maybe UK, where there are benefits that are obvious, but maybe some cons as far as what he wants. UK would provide more visability/publicity and exposure (in media and to NBA scouts), more competition every day in practice, likely better shot at deep run in tournament, etc....however it also likely would mean fewer minutes/touches and less individual focus.
If he wants to be "the man" somewhere, what better place than Tech?