Summary of the commentary: Kill_La_Kill twitter notes that Sushio attempted to fulfill Imaishi's request to "make it even more dynamic", leading to episode 4's... well... "quality."
After all the work they put in on episode 1~3, having quality not compared to was just not possible to avoid, with a week-worth of effort. And of course, some people still criticize to this day, since episode 5 went back to original directing team, and had equal quality to Episode 1~3, so...
