I just don't see how Whittaker can deal with the Chimaev grappling. MW is a barren wasteland in terms of grapplers and all he has in that area are wins over past-prime Jacare and Brunson, neither of whom are anything compared to Chimaev in offensive wrestling
Usman dealt with the grappling decently, but he's Usman, one of the best wrestlers in UFC history with a proven track record against grapplers like Burns, Leon 1, Colby, etc. Whittaker has the advantage of being a true MW and not on short notice, but that's it
I get the Khamzat overrated sentiment but he's an elite grappler about to fight in a division with no grapplers, so I think rather than getting exposed he's going to do the exposing