He has Siemian backing up Winston because Hill practices other things all week when Winston starts. When he is the starter, he takes QB snaps only. And, as per Kat Terrell above, it will be Hill if he is healthy.
That’s Kat Terrell’s take. I’ll wait on Payton. But I still don’t think Payton will try to ride Hill the rest of the season if Winston is done for the season.