I don't know if this is true but it seems to me as if the rebounding skill is not that important. You can still grab them with a player who isn't good at it...yesterday I led by 19 points with 5 minutes to go in my franchise (Nyk vs. Clippers) and the last 5 minutes, some backups played...namely:
C Lee Nailon
PF Lavor Postell
SF Frank Williams
SG Mike Penberthy
PG Howard Eisley
Three point guards in the game...and what happened? Instead of Sprewell often getting the offensvie rebound, Frank Williams pulled it down...he ended up with 4 boards in 5 minutes...the other rebounds were grabbed by Nailon or Postell....so it seems to me that it doesn't matter who is on the floor.
Kurt Thomas pulls down 11.2 RPG in 26 MPG...but what, if Frank Williams played center? I really think he would grab 10 per game then...I don't habve the time at the moment but it would be really interesting to have 5 small point guards starting and to see how many rebounds they would get.