Dubinsky played mostly left wing last year. The first half he played left wing with Anisimov as his center and Callahan on the right wing.
Rangers did not have a 1st line center per se. They moved around Stepan, Anisimov and Christensen for that while Boyle pretty much anchored the third line between Prust and Fedotenko which was surprisingly consistent.
The Rangers got hit hard with injuries--players were playing out of position a lot and we had numerous callups.
As for Richards--the Rangers should be able to easily find the cap space and there are good reasons that Richards would want to sign with us--which doesn't necessarily mean he will or that the Maple Laughs (sorry, but you earned that one if you're really a Leaf fan) won't.
Rangers have one of the best young defense crews in the league--adding Erixon sounds like it's going to make them even better.