KouAidou
二番目の翻訳者
Random hand waving like with VS Abaranger could work. It wouldn't be too much of a stretch to say Gai's dream manifestation powers could lead to him somehow coming back to life one final time.
Abaranger never had to deal with a DTV sequel, though. You can handwave a reappearance once; the more you do it, the more you start to strain credibility. (See: Worf's progressively more ridiculous re-appearances in every single TNG movie.)