TVtropes is notoriously wrong about many things as well.

And that photo has indeed been circulated several times. So the Ryugen suit is out there.

If episode 47 is really a crossover special and the plot does end with 46, I'm not going to be surprised if Jam is just in that one, possibly non-canon episode (or maybe they've already started filming this year's Movie War). I'm honestly not expecting him to have anything to do with the real plot.

After seeing the last episode, I'm pretty sure the show is going to end like Ryuki: with some kind of time loop that reverts the world back to somewhere near the beginning, possibly with the key characters remembering what happened so they can avoid their mistakes and do something to prematurely end the threat of Helheim. Maybe mai and Kouta become some kind of spiritual guardians of the world or something. Either way, I'm expecting to see Hase and Yuuya bumming around before the end credits.

With everybody's theories on time travel, what if the time line splits if someone went back in time? So the true ending of Gaim is in an alternate timeline, but the crossover special picks up with the regular timeline where Jam isn't defeated?

So basically pull a Madoka. (Maybe include something like rebellion.)

I think the whole series was Kouta's dream and when he wakes up he'll find out none of it happened, and Mai is using his shower. (Points for getting the reference)

Is this what you mean?
http://youtube.com/watch?v=nCEjeTb1rrs

You win :lol

Scrap my theory, I'm almost certain now that Jam would be just be a crossover villain. If episode 47 is like KR Wizard's final episode, then... Yeah, Jam could be, and most likely be the villain of that episode.

Did I mention that his helmet has the kanji for 邪 on it? Remember Fifteen who had the number 15 on his helmet?

Way to lack subtlety.

Good catch, who knew the word meaning evil could look so evil? And Jam reminds me of Kamen Rider Habataki...