In one, they just plain beat Maul. In number two, if Greivous started off close to Yoda, and they had a purely saber fight, then by the time Yoda got over to get help Mace, Mace may be injured. If he is, then, that will effect his later performances. Vader would be tough for either of them, and he would probably beat Mace after a long fight. But if Vader is attacked by both, he's going down. If they get a week of vacation, then only injuries would really matter, not fatigue. A possibly injured Mace and Yoda would take out Exar and be overwhelmed by DE Sidious at 6.