It's a Shanny RB. Of course you buy. The dude has done wonders for every guy he's had as an OC on. And a lot of these dudes did well in PPR.
Coleman and Freeman
I hear you and believe are correct. I don't disagree that the starter, whomever it may be in a given week will score points in SF.
Its the other thing to remember about a Shannahn RBs that cautions me.........they are just as likely to come out of nowhere as they are to be the original anointed one.
Go back over that list and a more comprehensive one, or just jog your own memory if you have been around awhile. Many successful Shanny starters displaced whoever had been the expected starter at some point in the year ..........and contract be damned as well in those cases. If McKinnon is the starter he better be prepared and capable to bring it every week.
Cheaper might be better all things considered.