Much depends on the setting illustrated below that you chose (or passed by without noticing, perhaps) when you set up your historical league. In future seasons, much will depend on the settings discussed in this thread:
http://www.ootpdevelopments.com/boar...d.php?t=151001
However, "sample size" is a frequent response that I have read in these forums. The game is designed to give realistic results
on average, over time.
It sounds from your post like you are basing your assessment on only a small portion of the season. I think if you play out the whole season, such aberrations that you described (which do occur in real life to the best players) will have evened out and the players you described will have performed close to how they did in reality.
But not exactly, not consistently all the time (which would be boring), and not necessarily for every player. There is a factor of randomness in this game which is either designed or tolerated according to your viewpoint.