I just wanted to show how easily a vice admiral was defeated.( this shows the power gap between the vice admirals and the admirals)I wasn't aware that Luffy had inherited the "World's Strongest Man" title now.
I just think that its stupid to assume that timeskip luffy isnt stronger than a vice admiral.
And btw do you know that when luffy fought the vice admirals his body had already past its limits and that he wouldn'tve been able to move if ivankov didnt give him the injections ?