Re: Drop one?
Definitely Crowder. Michel has first round pedigree and could easily find himself as the #1 at some point this season. As for Kerryon Johnson, he likely will be Detroit's bell cow at some point this season. You definitely want to hold on to these type of RBs if you can afford the bench space, because it's far easier to find replacement receivers than runners.
I don't know your settings, but if you get Rivers you may want to see if you can package up Rodgers and a player to get a top 10 player at the WR/RB position. Rodgers is clearly better than Rivers, but the difference is not going to be huge. The Chargers offence is for real, and they have a good schedule this year.
My two thoughts.
10-team Keeper. Everyone keeps 12 + 1 G + 3 "young keepers" (players with less than 164 NHL games played), and 1G. Points for G (2), A (2), PIM (.2), Hit (.2), Blk (.2) SHP(1), W(4), SO(8) Must dress 4C, 4LW, 4RW, 6D, 2G
C - Crosby, Backstrom, Kuznetsov, Eichel, Johansen
LW - E. Kane, Drouin, Schenn, Miller, Foligno, Zucker
RW - Wheeler, Stone, Lindholm, Oshie, Tolvanen
D - Karlsson, Carlson, Dumba, Nurse, Ceci, Pionk, Larsson, Montour
G - Murray, Quick, Koskinen, Blackwood, Georgiev
Minors - Turcotte, Bouchard, Kaprizov