I don't see any reason the Seahawks would trade Baldwin with 2 years left on a deal that isn't a bargain but isn't outrageous. Obviously same with Thielen in Minny.
Tyrell Williams is going to get paid, I'd be shocked if they brought him in. Humphries will get less money but still a size-able contract, and the Pats aren't dripping in space.
If they feel good about Edelman coming back (all indications show that they are) I'd be surprised if they pursued Golden Tate, who probably is a bit more of a downfield threat then Edelman but nominally fills a similar role and will have a market (probably like 2 year 16 million).
Belichick has raved about Green in the past, but unless they work out a trade and extension its difficult to see them carrying Green at a $14 million cap hit next year with Gronkowski on the roster. W/o him who knows if the Bengals want to trade him and what his market would look like.
Honestly an Amendola return makes a ton of sense, especially as he provides a modicum of Edelman-injury insurance and has shown he can execute the offense at a high level. No idea what his markets going to be either like but have to imagine it'll be lower then everyone i've listed thus far.
Other then that, there's a lot of flotsam out there. Could see them bring in a failed high draft picks again (Kevin White, Breshad Perriman, or just keep Dorsett). Maybe they monitor the injured guys (Bryant, D. Thomas, Sanders) and take fliers on ones that are the most recovered. Doubt they'll be interested in relying heavily on 30+ year olds coming off devastating lower body injuries though, but given the sheer number of old receivers they've brought into camp over the past decade I wouldn't be surprised to see one of them in Foxborough next August. If 87 comes back it will probably end up as someone that everyone is complaining about midway through next season (Cody Latimer, Chris Conley, Dontrelle Inman, or someone equally uninspiring), if not I have no idea what's going to happen as they'll need to restructure the offense to some degree.
Bummer that Mitchell's knees are paper mache he'd be providing exactly what they'll look for at a tiny cost if he was still on the roster.