Pretty sure it was the only one with serious problems.

Anyway, I think part of it was that he had to hold said leg over his head for the Darkness Moon Break. And with a good chunk of the weight there...

What is your possible theory of why Gou hate Roidmude so much? I ask that question because I heard Kiriko will be shocked at Gou's reason of Hating Roidmude. Maybe his reason is darkest?

Just give me a theory like for Example that Gou could have a girlfriend from USA and she was killed by Roidmude or I like to call "Kill The Girlfriend" cliche

Post your theory, please

Honestly, I don't care. Gou is just awful.

What's considered to be Den-O's final form, Climax or Linear?

I'd say Climax Form.

I would think Linear, because I see more of it.

Super Climax now.

When it was Ryotaro with the belt, it was Liner. With Momo at the helm, it's Super Climax (Or I guess one could argue Climax if Sieg isn't around).

Electric kind of hit it dead on. Ryotaro's final form is Liner, but since he's out of the picture, it's Climax.
However, I place Super Climax in the same boat Super TaToBa and Hyper Gattack. Because it can't be reliably called upon and exclusive to movies, I don't see them as their actual final form.

Okay, I've scanned he Vent Cards from Ryuki/Dragon Knight. There are 3 Survive Cards. One belongs Knight and Ryuki. Who has the third?

The third belongs to Odin. When you combine the three together it creates one big image. However in both Ryuki and Dragon Knight only two are used, Knight and Ryuki's.