If you understood coaching, which you obviously don't, you would realize that Gill makes chicken feed at a small school and probably needs to go to another small school (like the mac or conference usa) for 3-5 years making a few more peanuts before he even gets considered for a top head job.
if you understood human nature, which you obviously don't, you would realize that sometimes it isn't about the money.
he's building a program at buffalo. it's not much, but it's more that what was there. and he is appreciated back there, too.
does gill strike you as the type who would drop everything for a fat wad of twenties? that his loyalty extends as far as his next paycheck?
if gill comes back, it's because he's needed. and TO has asked him to comeback.
that said, i don't think gill will be back because TO respects turner too much to ask him to drop his own projects just to become an assistant.