Mine starts in football and basketball as well, so I've learned a lot this year.
Fortunately his other coaches understand that his college sport is baseball and they've let him play with his fall travel team against college teams, and let him attend two showcases and throw during the week.
Of course they've also allowed him to miss practice for recruiting visits, so it's really helped.
As for the college coaches recruiting him, they all know (and seem to respect) that he plays all of the sports, and the ones that we've been most impressed by actually came to watch him play football.
One of the first coaches who offered him said "if you're this good when you're playing three sports, imagine how good you'll be when you can focus on pitching."
Since that time several coaches have pointed that out, and offered, and those are schools at the top of his list...they get it.