How does it work with players playing both FB and BB?

There is no set rule, it depends on what both coaching staffs agree upon.  Typically the primary sport in which you are on scholarship takes precedence as it relates to team activities.  If there are holes in your schedule with primary teams schedule then typically you can do other activities for the other sports (teams meetings, practice, film, etc).  I'm not sure what Coach A's policy is on this, however, our coaches in general are pretty good about communicating with each other.  We are very fortunate that the support level of our coaches for other programs within the University is quite high!