The way I would think about this (very interesting question) is where are there obvious starting opportunities coming up in high octane offenses, and are there young talented players on the team at that position who could potentially explode?
My top five:
1) KC's starting RB, which is potentially highly productive. Shady is past it and I don't think he'll be back and Damien Williams is on a nice roll but I don't know if he's the future. That means Darryl Williams, who I thought looked good at times this year, is the obvious stash.
2) Green Bay's #2 WR is also potentially highly productive. They've been looking for a clear #2 after Adams and they one hasn't quite emerged... yet. Allison hasn't worked out, Kumerow never quite made it, but Lazard has looked pretty good the last few weeks. I would say he is the obvious stash candidate.
3) 49ers WRs are another high production position. Samuel has emerged as a star while Sanders has looked great but he is old and his contract is up this year. I think Jalen Hurd is an intriguing stash here.
4) Someone needs to be the #2 WR in New Orleans. I know Thomas gets all the catches, but a halfway decent #2 WR could also be super productive. That makes Tre'Quan Smith the guy to stash. He has speed, now he just needs to be a more complete receiver.
5) Likewise, there is an opportunity to be #2 WR in Indy, presuming TY Hilton comes back strong. Pascal looks like the guy to have there.