They have not said they 'plan' to go to the same school. They've both said that would be neat, but it's definitely not a priority for either of them.
Cravens thus far has publicly 'declared' three official visits, all to the B1G. Nebraska, Ohio and us.
Mathis damn near committed this weekend, and he said after this weekend we are his clear #1.
If I had to put my own money on it, I would say we have a much better chance at landing Mathis. Based on the comments I read from him, and the fact that his DC would be Greg Mattison (which I think plays a huge factor into the defensive recruiting success), I think we really could end up with him.