I've entertained ALL of these. 1 is basically true, although I really like the Belated Media version of the prequels, that just extracts Jar Jar. The whole Solo twins theory is the only one I outright reject of these. For so many reasons.
‘Star Wars’: Here's What Jar Jar Binks Sounds Like as a Sith Lord -- Ahmed Best, the man responsible for bringing Jar Jar Binks to life in ‘The Phantom Menace’, agrees with the Sith Lord fan theory. -- http://movieweb.com/star-wars-darth-jar-jar-sith-fan-theory-video/