I expect to see a few changes for the Bristol game. Marler in for Lambert, Lang for Smith, Ibitoye for Walker and possibly Bothma for Wallace. Should Brown be available, he'll get the nod over Ibitoye. We'll need to be a lot more physical early on if we want to come away with a win.
I'm not sure a back row of Bothma, Robshaw & Chisholm offers enough variation in terms of carrying, breakdown skills, etc. Chis & Smash are too similar to play alongside each other without a more specialised 7, I'd suggest.