Not a chance in hell buddy. You're also the same person that said this incredibly rediculous statement:
so I might be a little biased, but I'm having a hard time taking anything that you say seriously.
Shitty logic man. Dooku was capable of holding his own against both, Anakin and Obi-Wan, showing superiority to them in terms of bladework, yet he was unable do decisively beat Anakin in their 1v1 duels.
And it should be noted, that Kit and Nahdar tried to capture Grievous at first. "don't let him go", "dont let him cut a lines".
And cool, he somehow overhelmed Kenobi once... while how often Kenobi overhelmed him? Even excluding how badly he stomped him in their last saber fight in ROTS.
My answer is Kit, after a close fight in canon, and possiblt Grievous after a close fight in Legends.
You're ignoring a crucial part of the quote. Grievous didn't just fight both Nahdar and Fisto, he proved too much for them. Holding back aside, he was overwhelming both. Tyranus was not overwhelming both Anakin and Obi-Wan at the same time, in fact quite the opposite, which is why Anakin beating him 1v1 is possible.
But if Grievous is overpowering Nahdar and Fisto in an environment that was hindering him(the novel noted the hallway hindered him) then he's above either individually.
And if Obi-Wan and Grievous both overwhelmed each other a solid number of times, then that leaves them as equals, disregarding RotS where Obi-Wan was at his peak(and even then, GG's speed proved too much).