The other thing with Russell is that he played in an era where there was only 10 teams, and his team was absolutely stacked. He played with a half dozen guys who made an all star team and multiple hall of famers. In addition, Russell also had a height advantage of most players for his era. When Russell played in the 60's, there was only 4 players above 6'8, two of which were him and Wilt Chamberlain who absolutely dominated that ERA and the height did matter. There is no way in todays NBA any player is going to block 30 shots, or record 50 rebounds in a game and put up any of those absurd stats that happened back then when Wilt and Russell dominated.
I'm not going to say Russell wasn't a great player and make some dumb comments like "in todays NBA he would be a poor mans Deandre Jordan or Ben Wallace" but I don't see how anyone can say he was better than Michael Jordan, at least in my opinion.