What makes him so incorruptible? Sorry I just don't find enough detail of his personality to be able to say he would be one to hand back power to the senate (not saying he wouldn't, just that I can't find any evidence of his moral superiority)
Aulus Plautius was controlling several Legions in Pannonia (so we have army support) and he was a moderate character (with friends within the Senate)... With some republican "interests"... If he was elevated to Emperor i guess that we continue the same government style but with more republican "face"... Also he had some connections with the Julio-Claudians and we have continuity of the "dynasty"...
By all means i dont say that Plautius would hand back the power to the Senate (this would have removed the army support and perhaps killed him)... Maybe he would rule like Julius Caesar... Something like Dictator Perpetuus (in a new form of course) while reviving old institutions of the Republic (Censors etc.) and these offices being held from other persons... Not the Emperor... (Well he might held the position of Senior Consul but that happened OTL anyway)...
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