You can't evaluate someone's prime until you see all points of the career arc (rise to the top, top, and then falling from the top).
Lebron is playing probably the second or third best season in his career as an individual, running on 14 (I think) years in the league, a point where many NBA legends of old were outright retired.
For all we know, Conor might lose a fight and then Aldo/Alvarez five top 155ers in a row in 2018/19...or he may go on a coke and hooker run and get KOed in his next two fights...let it play out.