Palpatine fully turning into Darth Sidious seemed to spur him into issuing order 66. Was he planning to do so anyways, in the privacy of his control center, if Mace/posse had stayed home? He had already sensed Grievous was dead, right? Palpatine snapped when Mace said he's "under arrest" and he and his posse ignited their friggin' lightsabers. If Mace simply said "Chancellor Palpatine, General Grevious is dead. Do you still need your emergency powers, or should it be returned to the Senate?" , Mace and co. would've lived until tomorrow, if Palpatine delayed order 66. Help me out. Yoda- "Allow this appointment lightly, the Council does not. Disturbing is this move by Chancellor Palpatine." Anakin- "I understand." (suppressing his excitement like a little boy) Mace- "You are on this Council...but we do not grant you the rank of Master." Anakin- "......what?"