BTW I'm probably late to the party. But after getting lost in YouTube videos I'm convinced Jar Jar was meant to be Plaguis. Let's look at what I view to be the most compelling evidence.
1. He used what appeared to be a force jump.
2. Sideous got a transmission from someone giving the queens location despite quigon (sp?) Telling everyone no transmissions. Who sent it? Possibly jar jar.
3. His eye color matches a Siths lord.
4. George Lucas likes the idea of characters appearing weak and foolish and then becoming powerful. Yoda is an example. When first introduced Luke thought yoda was some crazy old fool. So it sets precedent.
5. There are scenes, such as every scene he gets promoted, that he's moving his mouth and hand, as if controlling others speech with the force.
And the most compelling. Jar Jar, a bumbling fool who supposedly can't do anything, not only has engineering knowledge which was shown when he fixed Anakins racer, but he became a senator? And then the literal representation for the queen in the senate. AND HE GOT THE SENATE TO GIVE DICTATORIAL POWERS TO PALPATINE. And oh yea, jar jar just happened to be from the same planet as a Sith lord. Palpatine and jar jar are from the same planet.
There's so much more to. I'm 100% convinced Jar jar was meant to be the main enemy, but backlash from the fans ended that plot line. It all just completely adds up and honestly in my mind isn't even a stretch. To me it's more of a stretch that it was all just one accident after another. A bumbling idiot lucked his way into giving a Sith dictator powers. I think it's clear JarJar wanted a Sith to rule, while he, plaguis, was the real mastermind, and the most powerful Sith in the galaxy.
Look at Jar Jars eyes and tell me that's just an accident.