Following his surgery pretty much forecasts his options going forward:
"I underwent shoulder cleaning surgery. The surgery was operated successfully so I’m relieved! I’ll do my best to rehabilitate for the return of new season. The surgery was done in one day so my family came to support me and my wife became a private nurse! (^_^) At the time of surgery, I’m truly thankful to the Seattle Mariners, its team of trainers, Tony of the Mariners’ interpreter, and my agents for the great support. I would like to give back to everyone by pitching on the mound next season. Thank you very much for your continuous support to all the fans! I’ll do my best to come back!"
He's essentially locked-in to prove his health following surgery by agreeing to someone's minor league deal and earning an MLB contract. The most likely suspects include our Seattle Mariners offering said deal and hoping for minor miracles, no pun intended. Kuma sounds resigned to "hoping" it happens for him in Seattle. I'm open, somewhat indifferent, with low expectations we ever see 2014-16 Kuma again. His recovery and return to form would be most welcome, however unlikely. Kuma's 2018 projection is currently wait-and-see, don't call us, we'll call you.