-Shoichi seems to know about Decade's journey. He must be one of the members of Wataru's group, even though the transition from friendly here to ominous enemy so quickly is odd.
I see Wataru & the others as the guardians of the multi-verse. They'll only get involved when it's necessary. Like when Dai-Shocker threatened the worlds as well as Tsukasa not doing his mission. While they're sympathetic, they see what's more important.
-Kabuto and Black RX basically beat Garagaramda by themselves. He was already finished when #1 and #2 used their Rider Kicks. Great scene for Kabuto and RX, including their group pose afterwards.
Wataru appeared in the begining of the series...he knew something...and Narutaki calls him destroyer...but he can't be one. and he was probably created for a reason...if he was created...he does not have a story...or background of his own. he had a plot...not story. did wataru needed Decade to play the role as the villain, hero, savior and destroyer?