More Moves for the Rangers?

So the Rangers have called up the Undertaker to take the place of Marc Staal on the blue line.   But what will they do to replace Ryan Callahan?   JT Miller would be the obvious move.  And if it's JT then the Rangers will have 4 of their last 5 first rounders on the team (Del Zotto, Kreider, McIlrath, Miller) with only Brady Skjei, unable to be called because he's still in school.   Another possibility is Danny Kristo, who was playing really well, but seems to be missing time with an injury.  Jesper Fast is also hurt.    Oscar Lindberg is available and is another possibility.  But I wouldn't be surprised if the next moves are Miller and a trade.    Just feels that way.