Thanks for coming back and updating us on all your 2017's decision. And Congrats on your son's choice and decision to go to UCSB. Great engineering school and gorgeous campus--for the life of me I cannot imagine how any student can find the dedication to go study in the library there when the campus on the ocean is such a distraction!
UCSB has a strong D1 program, so making the team as a tryout will be quite a challenge. But it is certainly worth trying out, and you never know what can happen between now and the Fall. No doubt the demands of an engineering major will keep him incredibly busy even without baseball. But maybe he will get the chance to do both. Good luck!