not that i'm anyone to commet not having either of these consoles BUT
i've found that if your doing this kind of thing, do a series of rounds, split them up in to like, 6 5 team rounds so that way if people do drop out, its only for a month or two, and then a new set of leagues is set up with the drop outs excluded. By the end of the season you may have 6 5 team rounds OR you might have 1 8 team round.
You'll have to put each monthly league in to a system that would mean fixtures would only be played the 4 times each, so your only ever in teh same league as a team 4 times. but this could be done using rotation.
Complicated but it could work?
i've found that if your doing this kind of thing, do a series of rounds, split them up in to like, 6 5 team rounds so that way if people do drop out, its only for a month or two, and then a new set of leagues is set up with the drop outs excluded. By the end of the season you may have 6 5 team rounds OR you might have 1 8 team round.
You'll have to put each monthly league in to a system that would mean fixtures would only be played the 4 times each, so your only ever in teh same league as a team 4 times. but this could be done using rotation.
Complicated but it could work?