If you do not fill any starter the coach will fill it with your players that are backup from that position. And if no player is set for that position he will just pick one for the spot before he brings in a lucky fan.
I think you misunderstood, I am talking about in a walkover. So the game isn't actually played, but I'm wondering how the minutes will be allocated if I don't set starters.
Sounds good, I'll let you know the result.