It’s certainly possible, but based on how things ended up with Colas and the Hawks, I would be absolutely shocked if we ever plays in Japan again.
From what I’ve gathered, the controversy boiled down to Colas misunderstanding the terms of his developmental contract: he thought he was becoming a free agent, but the contracted stipulated substantially more control left for the team. Whether or not it was an honest mistake depends which side of the fence you fall on — it’s possible the hawks were intentionally deceptive, or at least negligent in properly translating the contract (they have a history of service time manipulation with their domestic stars and are a ruthlessly competitive organization), and it’s also possible that Colas and his reps dropped the ball, or even that they just “played dumb” when they realized how hard it was going to be for him to break into the top team roster and he could get a bigger payday and opportunity in the US.
Regardless, the Hawks were publicly adamant that he owed them service, that they had invested in his development and it was a breach for him to take his services elsewhere before his obligation ended. It seems that the matter was settled behind closed doors, so it isn’t clear if they lost a suit or merely cut bait because it was going to be hard to have a productive relationship with the player after the ordeal. Both sides publicly cried foul play.
The NPB is way, way more conservative and old-school in how it operates when compared the to MLB, which is already very conservative in how it operates. This is my opinion, but for a player to have run afoul of a high-powered franchise like this (justified or not) and end up with another team would be scandalous, and the Hawks would likely have leverage to complain anyway.
Also, if it really is true that Colas was unfairly manipulated, I wouldn’t be shocked if he never wants to set foot in Japan again.
KBO is a different story, of course, perhaps. But my guess is he’s gonna hang out in Latin America somewhere and work out at an academy until the right time to sign.