If it was my Son, and he was serious about playing college baseball, then I would put him on a strength and weight-gain program between now and Spring baseball practice.
At 6'5", I assume he is a pitcher or 1B?
Either way, 190 is not enough.
Whatever his position is, I would also have him work with a local instructor on his skills over the Winter.
Make contact, if you haven't already, with all of the in-state college programs including JUCO's.
There is still time for him to get noticed for a Spring signing.