What Chael could and could not do against Bispind is not relevant, Bisping has some serious take down defences and was an opponent he had to prepare for in short notice. Bisping's style is miles different to Anderson's also so to say not doing this against Mr x means this can not really be a valid argument.
Has Anderson in the UFC ever had a change of opponent at late notice? Not that I can recall.
When guys within the business are split on there predictions pretty much, you know it is a real fight.
From what I can think, Anderson has never faced a top wrestler besides Chael in the UFC and it was that style everyone wanted to see him face. The one time he does he gets destroyed for pretty much the whole fight
Franklin, Lieben, Okami, Cote (joke of a fight), Belfort etc, all of them guys fought more stand up and did that against Anderson, Maia was Ju Jitsu and while very good his take down attempts at times can look average even not against Silva.
Dan Henderson is the best one I can think of but his best accomplishments seem to have come by his fists more than anything in the few years I have seen him, what he was doing years ago before I got into MMA is another thing.
Regardless of that though, Chaels wrestling is spoken of as more of his strength than Hendersons seems to be of his.