Rodman made two All-Star teams in his career and won 2 DPOY's. Made 2 All-NBA teams (3rd team). He's 10th all time in career rebounds per-game and 22nd all time in total. I'm just not seeing it. I'm seeing a player dominant in one facet of the game that was never one of the premier players in the game.
Two time DPOY but 7 time all nba 1st team defender, 1 time 2nd team. Known for much of his career as the best defender in the game. Also known for much of his career as the best rebounder in the game.
Won 7 rebounding titles. Easily the most dominant rebounder of modern times, probably dominated that statistic as much or more than anyone's dominated any stat in the last 40 years. Won his rebounding titles by around 30% at least 3-4 years in a row. If you look at the career leaders for different categories (ppg, assist per game, steals per game, blocks per game, PER, rebound%) you'll see that Rodman leads the rebounding% by the largest margin by far. The 2nd place guy is closer to 12th place than 1st.
"He's 10th all time in career rebounds per-game and 22nd all time in total" could arguably be replaced by "most dominant rebounder ever". Just glancing quickly at the rebounds per game leaders since Wilt joined the nba, it looks like, percentage-wise, Rodman won titles by 5 of the 6 largest margins of that 50 or so year period. Feel free to check them more closely, but if I'm wrong it's not by much.