I think that's a mental selection. Really thin for pace and back three cover. Brings Wales into it tbh.
Not sure what the thinking is to be honest, but I think Farrell has shown that he has a clear plan, so it's impossible to believe he hasn't thought it through. It looks like he wants to control the game through 80 minutes and prevent wales getting any momentum, per the Scotland game. It looks like Larmour has completely shat the bed, and I'd ld love to have seen Frisch or Osbourne getting a go, but Frisch doesnt seem to be on the radar and Osbourne is only back after injury. Even so I think even with a couple of injuries to backs we have too much for Wales. Fingers crossed.