He's on a rookie deal, based on his play he'll get another deal but hardly lucrative. He's playing for his livelihood, why not go to a team where he'll get more playing time and showcase himself. Hope it works out for him, ultimately it should make him a better player rather than waving towels on the bench. Good news for boomers. And let's face it, Thon and his advisor have never been particularly loyal.
Same situation happens everywhere, right down to here in juniors. Someone might be playing div 2 at a strong club, go elsewhere and their suddenly in div 1 and may get a look in seniors, whilst other kids can boast all about their undefeated div 2 season and never get look in despite being better player.