I can't say what their plan was initially, as I wasn't hired back then.
However, you're encouraged to train as many players as you can (6 for two positions, etc) but it is not guaranteed nor even often possible to do that, at least not on a regular basis. So, realistically, from my experience as a manager, it is probably wise to train no more than 5 (if going for 2 position training). Similarly, only 2 players would be realistic when training 1 position.