To clarify: I mean that I would prefer it, not that it actually happens. I do feel your suggestion of balance between backups and starters will help, at least in a 9 man rotation. I am not sure how the engine handles a single player backing up 2 positions. This is my major concern.
Maybe this clarifys my original question a bit better: I was wondering if any one had successful game shape with an 8 man rotation and how they managed it. With a 9 man rotation and 1 position training I am constantly having a player or two not get sufficient minutes during league play so I ponder the prospects of playing with only 8 but am concerned about overplaying starters.
Example of training 3 players for Passing:
GAME1 | GAME2 | GAME3
PG: A | F | G
SG: B-F | B-A | scrub
SF: C-H | C-A | scrub
PF: D-H | D-H | scrub
C: E-G | E-H | scrub