I don't think you know what you're talking about, in either direction you're going. Velks has never had a bad zem ever to my knowledge, not even decades ago, and at this point its the strongest zem pre-pop at its level range. Seb had an average zem forever and chardok's was way worse on combine and roughly the same on fippy through at least phinny; for some reason chardok ate a bump at some point and seb has just recently eaten a nerf.
As for moving, he clearly stated he is a necromancer. Necromancers are top quality dps in chardok. He's a tlp vet. He's not going to have any trouble finding a spot there. If it's an entire group moving and not merely him, it's still fine, because chardok just does not run out of camp spots thanks to pick zones. It's too big and dense.