The premise of the OP is will bad play adversely effect the DE for those playing exceptionally. Not how Sally Standsinfire will be rewarded [or not] for... um, well...being terrible.
I haven't seen any specifics on what a bad player's bad playing will result in for the rest of the group. I.E. Sally is trying her best but is kinda terrible. Only thing I seen on that was a short clip of Colin saying they were taking measure so DEs couldn't be griefed by bad players- whatever that means in the end, I am not sure of.
But I'd love more info if anyone has it.