Last year I had the same issue - a couple of players who started the season on the DL and missed significant time. So they couldn't be used in Real Time the first month or so as they had no stats. Then when they start playing and have accrued stats, they have an injury potential - and a long one at that. Both got hurt and missed even more time. I never got full usage from either.

I think the injury feature should be off in Real Time. Its too easy on early season injuries to get git twice - first they either have no stats or limited stats and you burn up their usage, then later they get hurt for an extended time. This is particularly bad with players with a long injury - 30 days or more.