Much like our Fanduel writeup, the question isn’t whether Lamar Jackson is the #1 QB as much as it is whether or not you need salary relief. That value seems to be there for week one outlined in the RB section below making Lamar a pretty safe cash game option that is easy to fit in punting one RB spot and one TE spot.
If spending down, Kirk Cousins is probably too risky for cash formats as the Vikings prefer to run the ball, but at $5700 he is easily stacked with Adam Thielen and a cheap option like Bisi Johnson or Irv Smith.