I think he'd stop Alvarez. I'd agree, he seems very complete at 154. He's evolved. He went from a terminator type body puncher, to a back foot Boxer. It seems like he's finally found his balance. Credit to him, he says he's refound his love for Boxing and it's showing.
I wouldn't argue all that much in regards to then as opposed to now being prime. Physical prime and fighting prime can be 2 different things. I wouldn't favor him over Canelo though. I have questions about his chin. 50/50 IMO.