Like Ozzy said, we have no clue. You call up these guys immediately and say hello....then what? you have never seen them play, (if you did you likely forgot) you didn't recruit them. You have not had time to evaluate them or the guys you inherited on campus. You have not had time to project scholarships going forward. You have no idea what your strengths and needs are. It's pretty difficult to have a conversation being unsure if you want this guy or you don't. It's better to wait until you have a clear idea.
I'm pretty sure they had a pretty good idea immediately because of how low these guys are rated. And maybe they saw them play somewhere last summer....or maybe dad or Billy did. They did some homework.
The easy explanation why Pitino called Tyus and Vaughn is because even if he didn't see them play, which is unlikely, he knows how highly rated they are. Not apples to apples.
Pitino is confident he can fill the spots with better fits for his needs. Letting those two guys go takes confidence and vision. It's going to be different in a positive way.
This is a positive not a negative. As Ozzy also said, it is a positive for the kids as well.
Nothing worse than coaching for a boss who did not hire you. It's even more so for a player to try an impress a coach who didn't recruit him. These guys get an opportunity to be "courted" all over again. Somebody will luv em.