Feels like they were very thrilled to have a movie greenlit and were quite ambitious to a point where it was almost like they were trying to cram as much possible in it. Conrad and these WKs being in a probably standalone movie almost seems like a waste compared to if this plotline had been fleshed out into a full length arc in the manga/anime. If BC were more of a "too big to fail series" like One Piece, then it could have been a more focused plot rather than trying to throw as much of the cast a bone here and there. Spoilers: (Jack and William don't ever get a chance to directly face off the WKs when that would have been great, Dorothy shows up early but then never shows up again iirc, ditto Leopold but that's pretty much his thing at this point) Got slightly frustrated at times with how to rush the plot there was a lot of offscreening stuff and cuts away from the action when we as fans of action WANT to see the impact rather than just a cut to them getting up and wooh where'd that blood come from, woah that must have been a great fight, wish we could have seen it etc. But what we did see was great.
feels kind of One Piece Stampedeish with lots of cameos and things like that but with a Film Z tier villain and plot.
another thing I appreciated about this is that we saw TEAMWORK and tactics in the fights, something which BC used to excel in but has been pushed aside in recent arcs since the power creep has gone through the roof. And speaking of Power scaling, they really went above and beyond to portray the WKs as just ridiculously OP as they should be. Definitely great additions to the BC universe.
Hope to see more BC anime and or movies in the future!