Just heard Jim Cornette on being asked what his "dream roster" would be and it turned into a very clear point being made that you can't just pick this, this, and this and have it be an amazing roster. Some guys are amazing at what they do in one promotion but in another roster just wouldn't work. If you got a roster of technical ground guys and one super high flyer the pacing gets off quick because they each have to stop the momentum on their side of the story and switch to the other guy's thing. He summed it up with the statement of "why didn't you like this guy? He's amazing." " Yeah, but not for the particular movie I'm casting."
Thinking on this I couldn't cast a roster with everyone I love together. The styles would clash and the in ring storytelling would build towards seperate products within the same show and the fans would never be satisfied as they'd argue over which half was better. It'd end up creating the Vince problem of a lot of the roster just plain not being able to make use of each other in the upper card unless I hit the lotto with several prodigies who can put on stellar matches with any style.
I think its like the John Morrison situation. Big muscular guy, agile, natural at the whole rockstar ego cool guy role. Does a few jumpy things like a no handed cartwheel, a moonsault and a corkscrew. Pretty agile guy. Put him in Lucha Underground though where the promos are few, and the high flyers are doing a million spins and corkscrews and while he still has some decent pull he just has less impact than he did elsewhere where he stood out more. You get over more there with a mask on than off, and the flippies are hard to keep up with in even the basic back and forth spots that tend to run long. He's great but its not quite his style enough to stand out there like he did in WWE.
I'd have to pick some sort of very tight structure to my roster to really make my product standout. A Bobby Lashley looking behemoth or a Super Flippy like Ospreay would only be side acts unless the card was built for that kind of show.