Is ‘peak’ even a relevant term? It basically just mean a moment of highest possible performance, no matter the duration.
I started my career as footballer last night, where I played against three neighbors of mine. At one moment, I flipflap-ed two of them and then lobbed the ball in the air, and did a bicycle kick (with my dong) past the remaining one and score a goal, before landing back on my feet. After that, I retired in glory. Don’t think R9 has scored a goal tougher than that.
So, at my peak, I am a better player than R9.
And ‘peak’ is the most legit term in football to determine greatness.