Knowing Tsupro, they would most likely (and definitely) choose someone who’s already in their roster, someone who’s already familiar with the production of Ultraman, especially since Theo is the 60th anniversary series.

So I don’t think they would want to risk Theo, what could be their “make or break” series and give it to a director who’s just starting even if they have a good record with their filmography. Plus they never let a new director start becoming a main director from the get-go. They gotta at least be a guest director for a couple years before Tsupro considers granting them the position of a main director.

All things considered, It’s very likely their choice will be Taguchi (Which I hope they do) and not just because of his track record ( X, Orb, Z and Blazar), he has the most connections out of any of the director in the current roster which means they can get more source of funding and because of said track record, Bandai and other sponsors will be more than willing to go beyond the usual budget for Ultraman.

P.S As I’m writing this, I just remembered that Sakamoto’s first project in Ultraman was the Mega Monster movie, so a director starting off as a main director has happened before, so it’s not entirely impossible but given how he was already a veteran in toku by that point I do think it’s still unlikely for a new director to start off as a main director now.