Why not? I've yet to have a client who would jeapardize a windfall over something that amounts to a few % of that windfall. It simply isn't an issue especially not for someone with grudens $$$.
Every day he doesn't sign is a risk. The risk UT could change its mind or someone like stoopes could swoop in and express interest for less $. Not a great risk, but a risk nonetheless for someone with $50m on the line.
If there's a holdup it isn't the TB $.