Years ago I coached both T-ball and soccer. Had the same sorts of problems with kids all the time. Kids would be standing out in left field kicking dandilions and chasing moths that flew up from the grass.
IMO, Mr. B has to come to the realization that this is what kids do and accept it - the kids (Mo included) aren't going to change.
After a few weeks I'd point out dandilions sticking up and ask kids why they didn't kick that one. They'd usually get it the next inning and look back to see if I saw them do it and laugh if I did.
How you get Mr. B. to accept it is the hard part of course.
I agree! Kids are going to be kids and at that age get distracted - the coaches just need to deal with it.
My husband was a coach of my daughter's T ball team. I don't think they are too young necessarily as they still learn valuable things - team work, waiting their turn (at bat), coordination and the basic skills of the game.
It can be fun - just the coaches need to realize about their attention spans. As they get more experienced in the game and one or two or 20 balls get past them, they will eventually realize they need to pay attention - yes - this could actually teach increased attention span - you will see the kids better and better at them. Yelling at them won't help though - you basically have to go with the flow.