I guess what is strange to me is that Goto (the strongest person in the series currently) said that attack was very good, and now muscle dude is refuting that. By shounen timing logic, the last person to make a statement (about strength) is usually the most correct, but I'm not sure how to reconcile the contradiction given their standings...
At the same time, Goto is a bit of an airhead who might say things flippantly, but he also oversaw Yuji's training earnestly, so I'm not sure if this is the author pivoting for power up opportunities, or a genuine wrinkle in how this power will be shaped.