They weren't completely exhausted, and he didn't stealth kill any of the main ones he fought, but yeah they were tired and unnerved somewhat. Although this version of Grievous has other feats like defeating Durge and Ventress "handily", dueling evenly with Windu, killing several companies of Clone troopers with his bare hands with minimal training ect. A company contains something like 124 clones. I think it can go away for sabers and he'd probably lose the all out round.