To me with vet signings, particularly vets with some time in or coming off of injuries, one question is the most important.
Is it a signing that realistically can help the team take a step forward? If the team were already a playoff team or in serious contention will he help the team maintain their current status or fill a role toward a title? See Lynch with the Raiders.
A team that has not had success or a young team, both apply to the Rams, is the team close to being a playoff team?
That is very debatable. The O line and D backfield may hold the key in this regard.
In terms of signing additional receivers, particularly to more than a one year deal, one name looms large IMHO. Tavon Austin.
The coaches long term view of Austin and his contract and value would figure into this as well potentially.
Unless McVey has already determined a negative toward Austin I don't see a trade like this happening. But, who knows?