I think on the average 1 of those 4 players will not be available at any point in time. There will be injuries, bad form, bans etc. Then there is the need to rest, due to the hopefully many games in all competitions, which means rotation is required. Then there is the fact that of those 4 players, 3 of them could in a meaningful way play other positions, such as on the left or the right wing, if Sterling or Sane should suffer from the aforementioned injuries, bad form, bans or simply need a rest. I think there would be plenty of game time for everyone.