The ones making the movie. J-Horror was pretty popular at that time and Toei wanted a piece of that cake.

Sano still scarred for life ;D

Toshiki Inoue.

If the Kenzaki that appeared during the end of Decade was supposed to be the original Kenzaki from Blade (Not an AU version, but the OG Kenzaki), shouldn't that have ended the Battle Fight in the original Blade Universe, since Hajime was the only Undead alive at the time?
(Giving the Decade universe the benefit of the doubt that Kenzaki existing wouldn't start (And immediately end) a second Battle Fight there)

Relate question: if that was meant to be OG Kenzaki, why was he still using the Blay Buckle instead of his version of the Chalice Rouzer?

Adding to that question: And why did he act like such a dick? :lol

Well, I'm pretty sure that's because he wanted to be Blade, and not the Caucasus Undead, considering how the Rouzers work.

Man Decade sure did make things confusing.

when you take out all the homages, Decade was just bad.

That happens when the creative team doesnt really give a damn if it makes sense.

Even with them Decade is just horrible. The homages were really badly done and mostly consisted out of "look at this suit showing up you havent seen in years" than actually trying to honor the character that wore those suits.