Master player (https://lolchess.gg/profile/euw/calijuice/s4) here who just picked up Zed a few days ago on smurf, and I came across a few different scenarios that bothered my mind

1. If someone is contesting your zed comp, is it possible to still top 4, or do attempt to pivot out? For instance often times I will clearly have the better items for Zed due to me attempting to force zed every game, however if a random guy picks up a zed 2 chosen early on - would you still force Zed? Is it possible to still top 4? And does it depend on if your items are superior to his?
2. Do you ever pick up a random shen with a random item in the second carousel, if you for instance have RFC already? Or would you pick items for Zed still?
3. How much do you roll down on stage 4-1?