Koby becoming top 2 would be the greatest jump in power ever conceivable.

He trained for two years + whatever time passed by now until the EoS.

Even monstrous top tier trained almost their entire life including Luffy and co
Coby was trained under Garp and cant move freely with a 5kg iron ball.

His epilogue will be "equally punching" with Luffy and then fade out scene because it would be obvious he would get low diffed even as an Admiral.
 
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