In fact, two of the most dominating players inside on defense in the past decade have been pretty short, Ben Wallace and Alonzo Mourning. Ben is listed at 6-9, really closer to 6-7. Alonzo listed at 6-10, closer to 6-9.
Since when are you a height regulator? I've never heard of either of these players being this short. The only player in recent years that I know of lying about height is Iverson(they say he isn't even quite 6ft) and Barkely(supposedly 6ft 4)
And, the bigger and stronger argument carries little weight because Wilt and Russell would have been bigger and stronger in today's game as well. They would have the same strength and conditioning training, the same nutrition and diet regimen, and would have been playing in an age where lifting weights and playing year round would have made them bigger and stronger. As for more athletic, that's pure conjecture. How can you definitively say Wilt and Russell in their prime weren't just as athletic as players today? You can't.
Not all players today lift weights. Some of it is just genetics. Tony Parker is on record saying he hates lifting and doesn't do it often. As far as athleticism goes, youtube Bill and Wilt and see how many spectacular dunks and athletic moves you see.
And, back in the 60s and 70s, there were plenty of big men that were plenty tough and plenty big and strong, even if they weren't legitimate 7-footers: Willis Reed, Walt Bellamy, Elvin Hayes, Wes Unseld, Nate Thurmond, Bob Lanier, Elmore Smith, Otto Moore, Sam Lacey, Leroy Ellis, Darrall Tucker. All those guys played in Wilt and Russell's era and were 6-10 to 7-feet tall. Kareem came in the tail end of Wilt's career. And, undersized guys that ended up being Hall of Fame type big men like Wes Unseld (dominated like Ben Wallace at 6-foot-7), Jerry Lucas, and Connie Hawkins.
You talk like Wilt and Russell played against a whole bunch of 6-4 centers, which proves you don't know what you're talking about. Sure, there were some teams that played 6-7 centers. But, there were plenty with big and athletic 6-10 to 6-11 centers.
Since we're playing the height regulator game, Willis Reed was listed 6ft10 but is rumored to have only been 6ft 8-9. Elvin Hayes was only listed 6ft 9 but was really about 6ft 8. Wes Unseld was listed as 6ft 7. Half of your list is just full of . And these are just a few players spanning a whole decade. The average for centers of that time was about 6ft7, maybe 6ft 8, the size of a big swingman in todays league, not a center. I don't know where you got anything about 6ft 4.
If you put Wilt Chamberlain and Bill Russell in today's game, they'd be just fine, especially if you also give them today's strength and conditioning training and today's diet and nutrition. Wilt was 7-foot-1 and 275 pounds and extremely athletic. Bill Russell was 6-9 and 215 and could shut down Wilt Chamberlain.
Bill Russell would have a hard time defending Duncan or Garnett, giving up 2-3 inches and 40 something pounds. Not to mention he couldn't leap with the guys like Amare, and shot blocking was a big part of his game.
Look at today's NBA. What guys outside of Shaq would really be too big and athletic for Wilt and Russell. I don't even think Shaq is too strong for Wilt and Russell. Dwight Howard maybe? Amare Stoudemire? Heck, Amare is only 6-9 and 240. He's undersized too. Think Tyson Chandler just cuz he's 7-foot-1 and athletic would be too much for Wilt and Russell?
Wrong
Your argument about Wilt Chamberlain and Bill Russell fighting to be role players in today's game is a complete joke.
That's something that you will never know for sure, but I think I did at least exagerrate a little when I said they would struggle to be role players. IMO they would probably be borderline all-stars, not superstars and definately not scoring 100 points in a game.