Garo tends to have a great track record with getting people back though. If everyone needed is free, I think they'd all do it.
It bugs me the way some things were done in Makai no Hana, with regards to what happened to Kouga and the fact he willingly gave up the armor to allow Raiga to become the next Garo. Rather than be a simple Raiga origin explanation, it just created more questions than it answered. Why would Kouga willingly do that? If Kouga shows up again, what happens then? Does he take the armor back from Raiga? Does Raiga take on another Knight's title? I'm usually not for having to tie up everything like that, something there felt deliberate in saying Kouga's still alive. That said, I think I'd have been happier if Kouga died off-screen. As far as I'm concerned, Soukoku no Maryu was pretty much the ending to his story anyway.
Having watched the Goldstorm movie last night, I'd actually be happier forgoing a proper TV series in favour of a couple of movies, with better production values associated with being a movie. I adored Goldstorm as a TV show, but something about the movie just made it feel more special, at least visually. It looked so cool.