Also, Dooku was unprepared for the attack, his force barrier/defence was down. Palpatine arledy showed that he can crub stomp somone who is comperable to Mace if not superior( Count Dooku) from across the galaxyīased on what is Dooku more powerfull then Mace in canon?. What canon evidence is that Sidious threw the fight? I agree that Sidious is still a more powerfull force user but Mace can contend with him for sure.
Mace allready defeated Sidious in a lightsaber fight. People here asume that Mace somehow makes difference and can help Yoda but he really cannot
I can see Vader being more powerfull then Mace but why do you think he can stomp him? Based on what? At Mace Soling, Canon Vader is alredy much more powerful than Mace to the point that he can break his neck with a flick of his finger and he is still far below Palpatine