There was a time last offseason when it might have made some level of sense, and it came up quite a bit. But the idea of Kirk Cousins being traded back to the Minnesota Vikings, to be the backup for J.J. McCarthy or even possibly usurp him on the depth chart if it came to that, has been put to bed in any place that really matters.
Last week, probably due to a lack of any other options to offer (and they offered no others), ESPN's Matt Bowen and Jeremy Fowler mentioned the Vikings as a possible trade fit for Cousins.