Regarding the Rangers, whose logo could well be a question mark heading into Tuesday’s Game 4 of the season, at the Garden against the Blues: 1. It is a long way to the Feb. 26 trade deadline, 60 games through which the Blueshirts must navigate from here to there. But the inability of longshot 18-year-old Filip Chytil to materialize into a lighting-in-a-bottle find in the middle makes it very likely that general manager Jeff Gorton will be hunting for an upper-echelon veteran rental center as the season evolves. And Joe Thornton fits the profile perfectly. The Post has learned the Rangers and Thornton had several productive conversations during the 38-year-old center’s free-agency period last summer that extended into midday of July 1. They ended almost at the same time Kevin Shattenkirk unexpectedly made himself available on a short-term deal and Thornton, coming off a serious knee injury, decided to return for a 13th season in San Jose. But there is no doubt both parties were comfortable and intrigued with the idea of Thornton coming to New York to team up with his pal and Team Canada teammate, Rick Nash, while bolstering the team’s middle.