Writer, Sho Aikawa, explains as to why Kamen Rider Decade made his return to this Sunday mornings Super Hero Time segment this week on episode 52 of Kamen Rider Wizard.
Directly from his twitter –
“ It all started with a near impossible request that goes like “Can’t we at least invite back one senior Rider?” but the producer claimed that “If it’s not the original Kuuga or Fourze, it’s meaningless.” it concluded with “Or it could be Decade.” and so, we put so much effort into the schedule and budget. Hence, this is what will happen next week.”
The likelihood of Joe Odagiri ever considering coming back to Rider is next to impossible, while AU version Ryouta Murai is busy with a television drama at the moment.
The finale of Wizard is this coming Sunday.