@ Nai
(I just read the first part of your posts there and stopped for obvious reasons)
1) You're missing the point. Yoda had to specialize on a fighting style to make up for his disadvantage is what you're telling me basically. And I'm telling you that in this fight, he didn't even have the disadvantage. Its like A'Sharad Hett vs Kenobi. Kenobi has mastered using the environment against his enemies but he was still in a disadvantageous position against Hett due to environment and had to use his env manipulation technique which is still an advantage for Hett as it wouldn't be the case on neutral flat terrain.
2) We don't even know how he disarmed him. And yes, it is a small detail since it happened under unnatural circumstances.
3) The senate pod was a disadvantage for Sidious. We've already established that the moment everyone realized Sidious couldnt pull his acrobatic stunts. He may have moved the fight there because he wanted to elevate to higher ground for using the other senate pods or perhaps he was simply arrogant enough to assume he could withstand Yoda even in a disadvantageous position. He might've even failed to calculate the advantage Yoda would have there. Stuff like this always happens. Revan for example is considered one of the best strategists in the lore but people criticize him for his way of reacting to Vitiate's FL in their fight. Bad choices by masterminds during under pressure and mid combat could be made all the time. After all Sidious was surprised by Yoda's attack where Yoda was mentally prepared for this fight(another advantage perhaps?).
4) Nah, none of your explanations make sense so I'll stick to "Sidious was disarmed due to bad setting".
You're referring to a single text from the novel yet many other sources (including other parts of the novel) state that Yoda was the one who was depleted. This is why I (generously) keep saying "Just call it a stalemate!"
Why was Yoda on lower levels when Sidious managed to get up so high in the first place? Clearly, Sidious was in control of the fight and managed to elevate himself in an advantageous position as after that point Sidious was raining pods on Yoda while Yoda was merely surviving and dodging the TK attacks. For the same reason, Yoda lost his saber as he had to leap towards Sidious which made him vulnerable to losing his saber so it again further supports Sidious' supremacy in the force).