The Rangers’ blue line has struggled as a group, and Shattenkirk is no exception, with a 47.4 Corsi for percentage at 5-on-5. The difference is that Shattenkirk, by reputation and renown, was expected to be a difference-maker. Fantasy hockey forecaster: Jan. 29-Feb. 4Matthew Coller breaks down fantasy hockey matchup data heading into the week of…