Uh, have you ever seen the S.I.C. logo? It says "Super Imaginitive Chogokin". You can still see those words on the Tamashii Nations website (although they're a bit tiny there). Nothing says it has to stick with Ishinomori-related characters. Or else there wouldn't have been those KT Garo figures. Even if the line ever was referred to as "Shotaro Ishinomori Creation" or whatever, Bandai are evidently able to ignore that. Actually most modern Rider series didn't have Ishinomori work on them either, so post-JAKQ sentai are about as Ishinomori-related as say... Den-o or Kiva. Maybe not quite, but Sentai is a franchise that spun off from Ishinomori's work, and current-day KR is the same too.