I could have a team of 5'10" players and their rebounding skill is high and they will out rebound a team of 7'4" players who have a lower rebounding skill !
This is correct, but you would be much better off with the 7'4'' guys if you plan on training rebounding or any other inside skill. Give a season or two of training and the tall guys have improved a lot while the shorter players haven't improved nearly as much.