I'm too lazy to work it out but trusting you on Backes being a monster I think I might want Landeskog over Seguin anyways, for 2 reasons. Landy is probably never going to match Seguin in points, but multi-cats he will be a hits and blocks monster. He will probably play SH and PP situations, where as Seguin will probably not see much SH time, especially with Bergeron on the team. Points only you want Seguin every time, but think of Landeskog as a more skilled Dustin Brown, and for that matter Backes, who just isn't as proven. He will get you at least equal points but almost always high, and similar other cat stats. Secondly, Landeskog is a designated winger. Obviously at the moment Seguin is a winger too, but he was drafted as a center and it is his natural position. Three years down the road who knows what happens in Boston with Krejci, Seguin may be moved back to center and lose his wing eligibility. Good centers are just plain easier to come by in fantasy than wingers.

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12 Team Keeper, Keep 17, Keepers
Roster: 4C, 3RW, 3LW, 5D, 2U, 3B, 3IR, 4G (Start 2)
Stats: G(3), A(2), +/-, PIM(0.5), PPP(2), SHP(3), GWG(2), HITS(0.1), BLKS(0.2), W(3), L(-1), OTL (1), GA(-1), SV(0.2), SO(3)

C: Crosby, Tavares, Nugent-Hopkins, Johansson
LW: Hall, Parise, Silfverberg, Skinner, Conacher, Jokinen
RW: Seguin, Hossa, Wheeler, Burns, Pavelski, Yakupov
D: Doughty, Fowler, J. Johnson
G: Schneider, Hiller, Fasth, Nabokov