Not quite sure about the full squad = injury magnet theory because I played with a full squad in Seasons 1,2 & 4, with not much injury concern and probably only had 4-5 players out at a time in season 3.

Last season had a 20-man squad, probably had 4 players out at different times in the season. This season, I have a full squad and I have 4 out short-term, one was during the short pre-season, one was on opening day & 2 were injured yesterday in two different matches, but those I can blame on lack of match condition, both started with 75% condition.