There weren't that many. It could just represent that there were other Riders with him, and they went with Suika since it mostly hides their bodies.
Kaito's side also had an army of Invess too, don't forget that though...
Then why was it that Kouta's side had only the inves and no other riders or the suika arms by his side then. Also for the music collection, is there any word on the music video that will be included, if there are though?

