Rangers need Offense and Yandle isn't used properly anyways. Boston needs future depth on D. Neither team can part with either player for picks/prospects ad they are fighting for playoffs.
Ottawa needs a scoring forward and the rangers could use a 1st rounder to replenish prospect pool. Cowen will be a serviceable 6th d man for the playoffs and then can be bought out in the offseason to get a Cap Credit that the Rangers will desparately need in the offseason