he very likely could've been stronger in his prime (he was pretty much retired for 12 years at Shukai).
The other 8 went on suicidal charges after RSJ's death, Gyou'un and CGR stayed alive due to the prophecy. A Prophecy for which Gyou'un was willing to ignore Bananji's ordered retreat and fight with a crippled arm. With the prophecy being about him painting the lands red with the blood of the enemy, why would he not be training and maintaining his prowess? Ignoring that he's around the same age as Tou/Ousen/etc, younger than Ouki/Renpa neither of whom had any implied decline in martial prowess.
I think @Owl Ki already made a post few years back about how the statement was just him being surprised at / not being able to comprehend the strength of the youngin he was witnessing. Since he came in looking down on Shin, and only gradually as the war progressed did him and CGR start to accept that Shin and Ouhon just built different.
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Yoko Yoko > Bananji I’ll say that much @Xione
But Yoko Yoko > Base level Bananji I can see it.