So basically, if you chose soccer, the manager would be able to compile a team based on the opponents they will face. Example, When Manchester United plays City or Liverpool, Sir Alex always plays his "A" team. The big guns make up that team. If they play Stoke City perhaps or some lesser rival, he would probably go with the "B" team made up of more reserves.
Correct understanding Mac?
P.S. based on the above, shall I simply select some players for the selections table instead of leaving it blank? How do you link up the fixture_id from the fixture table with the selections table?