Every NFL game is a toss up to some degree, but I don't think the Vikings pose the same challenge.
I can see why people would make the connection because the Vikings have really good receivers, a great back, and a good defense. However I don't think most here appreciate how good Tannehill has been over the last couple of seasons; he had a better season than Russ last year depending on which metric you look at. Cousins is a clear step down from Tannehill as he's less efficient, throws more INTs and takes more sacks.