I talk about this in another topic, I think the core idea is that they have to treat the alien from another weight as a wild card. There are good reasons for this. I likely haven't had a lot of recent head to heads, and most of all, there is no way to tell for any them whether they are gonna be a juggernaut or a skeleton at the new weight. Even if we knew how much they were cutting it would be hard to tell what aspects of recovery would be compromised, bad weight cuts can come out of nowhere.
So if you've made that decision, which is sort of a punt but also sort of prudent if you acknowledge that seeding them in would be even more of a crap shoot than usual, the smart thing becomes preserving the integrity of the seeds and keeping the wildcard as far away from the one seed as possible.