Can the Kryptonite be created by World Engine when they used it in Man of Steel? (since Supes pod arrived alone and there was nothing green in the phantom zone)World Engine supposed to change Earth into a planet just like Krypton, so my guess is the Kryptonite with Lex is from the ocean where Superman destroyed the World Engine.
Quite possibly, but when watching again I noticed that after escaping the phantom zone, a bunch of krypton rocks get pulled through the hyper space jump zods ship makes.
They'll prob get a CGI Richard Pryor to detect some though.