If the Rangers decide he is, he stays. The team is trying to win this year. They aren't going to have Desharnais as the 3C and Nieves the 4C. Maybe if we acquire a center in a trade, this equation changes.
I think the chances he plays this season with the Rangers is over 50%, likely close to 75%.
Even if we acquire another center, he's probably our 4th best center, anyway. Maybe we could go with Desharnais as the 4 and Nieves the 5, but even then, they might still prefer Andersson.
Blame the GM for how poorly constructed the team is. I completely agree with you, but I'm telling you how things stand with the Rangers. It doesn't seem very likely he won't play with the Rangers this season. The 9 game thing usually applies to teams that are not competing for the playoffs or are competing, but have enough depth that they don't need to keep a player. That doesn't apply with us. We are contending and have poor depth at Andersson's position. If Andersson doesn't stay, its probably because we've acquired another center, and they decide to go with a weak 4 and 5 centers.