Why do you assume it will be someone like Yodwicha? It never has been in the past. It's always just guys who never really stood out or who were good once but are past their prime now. Probably someone more along the lines of Nontakit Tor Morsi, not him specifically but that kind of guy. Someone who's a decent stadium fighter but doesn't really mix it up with the top guys, for the most part, and fights somewhere between 135 and 147lb. All of a sudden they get little bigger or get the chance to fight international and they look amazing.
Again there was nothing particularly distinctive stylistically about the guys who were doing muay thai and then found success in kickboxing. Was anyone talking about what an amazing kickboxer Superbon would make? Not that I am aware of, and he was a damn good stadium fighter. You would have dismissed his chances too. Now all of a sudden he's doing kickboxing and people can't get enough of him. I don't know what to look for stylistically in a potential kickboxing crossover, other than that they shouldn't be a total nobody. I don't think that it really matters.
The point of my original post was that the fighters who have ended up in kickboxing might as well just have been names pulled out of a hat. It isn't as though there was any real intelligent design into which guys they brought in and which ones not. Why did Buakaw end up in K1 and not some other Thai? Did K1 know something we didn't and know that he was destined for kickboxing greatness? No. The general policy around Thai signings seems to just be grab the nearest, most readily available and well connected Thai. Kaew ended up in K1 because of he was fighting in Japan at the time, Kongnapa was brought in because he was Kaew's stablemate and they needed a short notice replacement, Petchtanong and Superbon are connected to Buakaw so they get a hack at kickboxing too. It has far more to do with luck than anything else. And yet these guys are still incredibly successful in kickboxing, because kickboxing ain't that tough.
The attitude which MMA fan take to wrestling crossovers seems like the appropriate one here. No one doubts that wrestlers make great MMA fighters, even if they don't always pan out. There isn't really any particular style of wrestler that makes the best MMA fighter, but they still know that wrestlers make good MMA fighters. Again, the best wrestlers don't always make the best MMA fighters but they're generally better than the lesser wrestlers. And there is reason to be more excited about some NCAA div 1 All American than there is some random junior college guy who never accomplished anything. They are much more likely to be the better athlete and therefore better fighter.
Might as well just throw shit at the wall, something is pretty much guaranteed to stick.