Hold up - I just realized that since RKFs are so modular, you could actually have Saikou's alternate forms(like the shield and the leg) on the other Saber figures.

I've never been so excited for an RKF lol

So wait, the X-Swordman book is bigger than the normal WRBs right?

At least thicker, since it's got twice as many pages.

I think it is quite bigger as it appears to be the same size as the Primitive Book which is shown to enclose an entire regular WRB.

If this is true, I bet we see upgrade items for the side riders (Buster, Kenzan, Slash) that are in this size.

You know what, now I compared it to the Calibur Driver and it appears to be the same height, but closer in width length to Ja-Oh Dragon.

Im not sure, the peg looks different from dragonic knight set or hybrid rise. (Even the balljoint from normal saber RKFs and the one from dragonic knight is different) Its a shame, tho. I wan to mix and match it too

I'm not referring to the little pegs - I'm talking about the entire arms/legs. Since RKF Zero-One, the shoulders pop right off of the torso of these figures very easily. It's how RKF Dragonic Knight works, except they pop off more easily for that figure since the ball joints are smaller. I pop the joints off these figures all the time for fun. Hell, they're even compatible with gunpla ball joints. I've bought extra figures just to mix and match, and I'll do the same with Saikou. Dragonic Knight is the only outlier. Since I don't think RKF Saikou is actually intended to do this, there is no way his shoulder joints will be as small as Dragonic Knight's.

If you wanted to just remove the arms alone(Buster, Kenzan, and Slash already accomodate for the gimmick anyways), you can easily do that on all of the RKF Saber releases, too. I'd rest assured that Saikou won't be an exception.

Oh, I see. Looks like I'm misunderstood your point. Sorry for that.

I do the same thing with my regular saber. Sometime I put Buster Jakkun to Saber, yea you're right. Its fun! And know that the joint is the same with gunpla, I think I'll do some experiment.

Wait, if Saikou's gimmick is parts-swapping then what's the faux-hinges on the chest and shoulders for? Were they just red herrings to throw people off or something?

I think it mostly has to do with Shadow being just a shadow of "Saikou" in its most literal sense. Saikou's main form is a sword with hinges on the chest and Shadow reflects that directly because that's his "main form."