Sonny was a hothead can't talk business with him Tom's appointment was in peace time

Vito wasn't exactly overrun with choices He knew Sonny was a bad Don, Tom wasn't a wartime Consiglieri

I don't think Tom put all the pieces together of Michael's baptism murders master plan In fairness they played everything close to their chest and needed him to be clean

He knew they were going to come at Michael but then says he thought it would have been Clemenza not Tessio He knew Tessio was a dead man but I reckon he didn't figure the brutality of it all No one did!