I don't think SB wants shot of Marcus at all. He absolutely understands how good he is ..but he probably also understands that a cavalier 10 doesn't win you much at 6n level.
Whilst Fin Russell isnt the runner like Marcus, he's a similar off the cuff player..but Scotland had no other options so have spent the time to develop him. Now he's one of the best in the world.
Marcus is seen to do too much himself whereas Fin Smith "supposedly" let's the team do the work. We still need to see that really come through ....
It almost feels like a Mehrtens v Carlos Spencer scenario...where the maverick unbelievably skilled Spencer didn't start the games.
As for 15...Marcus is not a 15. But Steward is not fancied, Carpenter not, not many others so Daly is back. I personally think that's a backward move but is why I tend to defend SB more than I should as it highlights the status of the Prem at the moment. A poor development tool for international rugby .