That is not a good package for Rinne. He was injured most of the season and had surgery to repair whatever the damage was as soon as the season ended. Mason is a HUGE gamble and the 9th will be a good player... in 4-5 years. Even an impact rookie only scores 50 points. Rinne is still a top-5 (and I could easily argue top-3) in the NHL.
If you are in a big rebuild Rinne is the guy I would be building around. Elliott is the guy I'd want to move, if you want to move a goalie. Packaging him up with another solid player for a guy like Lehner is what I'd try to do. I certainly wouldn't entertain the offer on the table.
16 team, full keeper
19 roster players, 15 prospects
Stats: G, A, PPG, SHG, special teams assists, SOG, FOW, PIM, hits, BS, +/-, W, SO, saves, s%, GAA, SO saves
C: Crosby, Malkin, Killorn
W: P. Kane, Jagr, Ott, Burrows, Purcell, Tlusty, Clutterbuck, Zuccarello
D: Karlsson, Giordano, Hamonic, Gunnarsson, Smid, Grossmann
G: Price, Smith, Greiss
Farm: Enstrom, St. Louis
IR: H. Sedin
Prospects: Cizikas, Gaudreau, Sheahan, Bärtschi, Atkinson, Teravainen, Jensen, Ceci, Koekkoek, Emelin, Rundblad, Grubauer, Kuemper