The only one who can beat me is me
Sengoku didn’t try hard bro
WB’s portrayal was crazy in MF but I don’t know how that diminishes Sengoku’s. We can conclude a lot of things in MF based on what we fixate on but none of them tell the whole story. Garp alsp said he could have killed Akainu and told Sengoku to keep him in check. Sengoku was spanking the BBP and Garp sat there looking pretty. Both weren’t trying real hard for some reason, Garp had no excuses there. He has no excuse on why he won’t blitz Blackbeard when their base is getting destroyed.
Portrayal doesn't require you to try hard.

Issue is Sengoku took action and failed miserably, Garp just sat there and looked pretty.