[quote=@Feisty-Pants]
<Snipped quote by PKMNB0Y>

Good God.

Sasaki is terrifying! 
[/quote]

He's just a hard worker Q_Q

[quote=@Feisty-Pants]
How strong is level 4 in comparison to 5?
[/quote]

Depends on the Five. Using canon, #3 and up far outstrip any Four, #4 Meltdowner is a push-over, #7 Attack Crash literally makes no sense but seems to be as-strong-if-not-stronger than Railgun, and Mental Out got beat by a fellow mental manipulator at Level Three (though to be fair Ayu was specialized to beat Misaki and was also backed by a FIVE_Over, so there's that) but is otherwise actually really good if she didn't have morals.

#6 is capable of, as we know, [censored] which is far [censored] than [censored]

EDIT:  Of course any battle is one of compatibility, so it would also depend on the opposing power. I'll be honest, there are some powers out there that probably don't even need anything higher than Three to be more effective than a Five.

Assuming no morals, though. Morals just get in the way of power level arguments.