Keep him in the cage for a little while until the chickens get used to him. After a couple weeks let him out of the cage and with the chickens if they still pick on him keep him in the cage. This is what I would do
Hi I bought 8 chicks yesterday day and today one chick died, but the one that died came back to life! I’m not lying, so we took it inside and it also has a impacted crop also keeps twitching and jumping and lays down. Please help, thank you.