I have been faced with a similar situation but am lucky enough to manage six sides. My problem was having a kid good enough to play goal keeper in my b side but not good enough to play in the out field . As a coach of under 9 players I want to make sure I develop players that are able to play in any position down the line as I dont feel that at such a young age you should be stereotyped into one position .
I made the tuff call to drop this kid to the C side so that he could properly develop as a player .
Regards
Grant