Seriously? Knuckles needs more respect here especially the Chaos form which I think suits Knuckles more than Super Knuckles since Knuckles is the Guardian of the Master Emerald which is green.
Idk about Knuckles power lvl, but I think that the end wasn't that crazy. Keep in mind that Juggernaut has no flying skill at all. The moment you send him to space, it's bye bye to him. And, Knuckles wouldn't stop juggs like hi did in base form. It was a cool animation, and the creator took some liberties when making it.