These can't be simulated.
Every keeper on the TM has about an average rating of 9 with bunches of 10s.
I've had maybe 2 or 3 10s in 40 seasons from my keepers, and I've had a couple very very good ones and they would typically only get 8s and 9s.
And where are these MCs that are scoring 30+ goals and 40 assists? Why don't mine do that? No one in the game does that, so no, the stats are random and totally unrealistic.
Plus I started looking up the lowest rated players on the TM to compare, and they too have incredible stats. I don't think too many players in the 60% range will be getting a goal a game, sorry.