Some people get a bit of gyno, not from estrogen but from prolactin. Fags on bb.com called it a "delayed gyno" phenomenon. It's just that these little fag boys did their cookie cutter cycles and took nolvadex for weeks following their cycle. Once the estrogen suppression was stopped, that and prolactin would lead to a bit of gyno in folks that have really high estrogen and/or prolactin.
Same changes of gyno as with other steroids. It's more than just estrogen at play. That's why the cookie cutter cycles and steroid advice needs to stop. Understand what the fuck you're taking and it's not fucking rocket science.