Compare him to Javale though:
Chandler: 9 drebs 0 tos 2 fls in 28 min = +27
McGee: 3 drebs 4 tos 4 fls 1 blk in 19 min = -21
McGee is potentially giving up 12 more points on his TOs/Fouls alone than Chandler, he's also not securing the end of as many possessions which is ~4 points.
That's just the box score stats, from experience we already know that Chandler is far less likely to blow schemes ball watching, not communicate with his teammates from behind, suddenly sprint randomly down court, etc. McGee blocks three or four times as many shots but I doubt the players, especially vets, feel as comfortable with him behind them as they do Chandler who erases so many mistakes through experienced D moves.
Speaking of the Bulls above, Robin Lopez is one guy I like watching, other than beating up mascots, who like Chandler will take those one or two subtle steps with his arms out and completely scare away dudes and blow up sets, even goof up screen plays*, all while almost never jumping during the entire game.
*And I don't mean the type of screenplay in the movies. /ClarkKellogComedy