Mace is still second in command and still Dooku is stronger. Why you keep asking. Where did you get the impression that Plo is anywhere near Mace ? When he was killed by two clone pilots in starfighters - really impressive...
No offence, but anyone would die in that starfighter, so it does not make Plo Koon look like a weak chump because of it. Unless your saying Mace Windu is so ownage he could have outmanuevered them and escaped.