CTTE for me has always been their peak. The last Yes album featuring the brilliant Bill Bruford. Alan White was a top drummer but so different than Bill, who's intricacies and detail for me make him the best rock drummer ever imo.
Alan is more a straightahead rock drummer but Bill is more than that, like Steve Howe he incorporates different styles, especially Jazz into his playing. Like Steve Howe he is a fusion player. King Crimson were very lucky to get him.
I hold CTTE as the greatest Prog album. Who else could come up with that long complicated but wholly listenable intro, And the beautifull And You And I ?