I went on a tangent the other day about Russian players staying in the KHL and the potential trades offs between coming stateside to play in the NHL. This friend I was sitting with told me to shut up and astutely pointed out I had passed a recent opportunity for the sake of my family, comfort, familiarity, etc to effectively operate in a less "prestigious" market. He said that's the same thing. It was a good reminder.
We automatically assume our perspective is the same and that the NHL is the best, the most money, etc. etc. who wouldn't want to come here and play (ignoring the whole AHL thing). For some players, the jump might not be worth it and they are just generally happier being in a situation where they are closer to their own language, culture, comfort, family, etc. when offered the outside chance of riding the bus between Grand Rapids and Columbus to play in front of 200 people with the off-chance they could work themselves up to playing 10 minutes on the 4th line of the Red Wings, who are competing for Bottom 10.
I don't know the specifics of Grewe's situation but I get it when a player passes up the jump. It's not for everyone. Any more that offering one of you the opportunity to go work in manufacturing and logistics in Guangzhao, China for 20% more salary than Metro Detroit and the chance of being promoted to a position higher. Doesn't seem as glamorous