To be fair, I don't think he was actively seeking a job. He told Kevin Foote the week before he was named TTU HC that he was gearing up for the following season. Foote said on his show that Glasco always shot him straight. I think it was a situation that came up, he entertained the position, thought it over, and decided it was right for him, and all that happened in a week span. I cant fault the man for doing what he thought was best for him and his career.
I dont think he received much of a raise, but a job is more than your salary. I think its been established he was enticed by some hefty NIL promises, which appeared to have panned out (see NiJaree Canady)