Oh take the stick out yo ass! Ecchi is life! :D
No one I can recall in story said that about Kenny, but I ain't about to go back and check.
FAKE Bach (Royd Lloyd) said that he was disappointed in Kenpachi after he whooped him and said that perhaps he didn't deserve the Special War Potential classification, or something to that effect.
Technically, YHWACH never fought Kenpachi. Kenpachi fought Royd Lloyd(who possessed the mimic strength and form as YHWACH_. Kenpachi previously defeated Loyd Lloyd(who possessed the mimic strength and form as kenpachi zaraki).
A very interesting story. If it is true what unohana said that kenpachi subconciously restricts his power to the power of his enemy. Did Kenpachi unconciously realize that FAKE YHWACH was Loyd's brother?
Important to note that, Yamamoto also fought Royd Lloyd(who possessed the mimic strength and form as YHWACH). Royd forced Yamamoto to go bonkai. Royd then was defeated, and the real YHWACH showed up.