If we were going to make a trade for Watson after the draft. I think the most viable scenario for that is if we keep Darnold, trade back in the draft, get extra picks for next year, and then involve Darnold in a trade for Watson.
To me this would also be more palatable, since we'd likely be trading away shittier picks as we'd likely be drafting an elite wideout this year and having extra picks to trade