In a keeper in makes no sense at all to drop RNH because you may be missing him for a month or two. That's the kind of move you'll be regretting after...a month or two. No injured reserve in your league? Even without it, I'd be keeping RNH.
Of course if you can trade him for equal or better value you can go that route, but don't drop him.
12 Team Dynasty, H2H (points)
Dress 2C, 4W, 1F, 4D, 1G (Daily)
G (3), A (2), STP (1), SHOG (1), +/- (0.5), SOG (0.2), Hits (0.2), Blk (0.2), FOW (0.1); W (5), SO (2), Sv (0.2), GA (-1)
C - Draisaitl (W), Hughes, Larkin, Trochek
W - T.Thompson (C), Pastrnak, Reinhart, Nichushkin, Batherson, Sharangovich
D - Dahlin, Theodore, Bouchard, Faber, Werenski, Skjei, Forsling
G - Jarry, Gustavsson
Fm - Bordeleau, Barlow, But, G.Perreault, Morrow, Perunovich, Nikishin