Hadn't looked ahead to consider upcoming schedule/bye. Siemian has three good match-ups (@TB/ATL/@SD) while Winston has DEN/@CAR/bye. I picked up Siemian and will likely start him this week, and obviously on Winston's bye. Would consider next week as well (although I think Carolina may no longer be a super scary match-up).
FYI, after the bye Winston's schedule gets significantly easier, with only @KC/SEA in Weeks 11-12 giving pause. And of course he has the two NO match-ups in the fantasy playoffs.