Star Ian McDiarmid even confirmed it, saying: ' one point the script had the line in that first scene with Adam, when he says, 'You're a clone'. Knowing that he'd have to wait for a natural heir to the Sith to come around, Palpatine's soul had to jump from clone to clone, supported by all that machinery. So obviously he wasn't going to pick this guy to take over as the omnipotent Lord of the Sith. The one that survived, which would become Palpatine's son (and Rey's father), was so disappointingly ordinary that Palpatine couldn't even look at him.
