how much worse to start from pitlane than back of the grid?
My guess ~6 places off the start.
Given the speed of the RBR and the lack of pace of the back of the grid cars, it won't take him more than a lap to get back to where he would have been had he started on the grid, plus he won't be in any first corner carnage.
Don't count on it. I can't imagine the back of the grid guys being too easy on him. My bet is he'll have trouble at some point coming through the field, puncture would be nice.
They won't have a choice, the RBR is going to just sail by in a straight line.
Not sure about that either to be honest, it's never been a quick car on the straights.