[Guyver Spawn]

It's lucky guess. Dairanger and Kakuranger were also used for MMPR. They can use those two to cash in on MMPR nostalgia. I doubt Ohranger and Carrnager would sell well here in the US. Maybe I'm wrong, but who knows. Even if they do somehow release the other Super Sentai shows on DVD, they might leave it unfinished if they don't sell well.