What was the point of spending several episodes on "weak" demons when they're now just fusing back into one? Just seems pointless and anti-climatic. Why create 3 weak versions first? Does he think he's a jrpg-boss?
You're asking why the badguy just doesn't start out the fight in his final form? Have you never shounened before?
Originally Posted by Buffalobiian
His new Kanji says "monk" though so presumably he "unlocked" some form of enlightenment.