Managed Migration to UC and new Descriptors as of 2025

I hope moderators can shed a little light on this. As we now know ESA claimants will start getting migration letters from September, it crossed my mind that as those in SG of ESA get migrated before the new descriptors of WCA come into effect in 2025, they will go into equivalent of SG in UC. Might that mean that only LCWRA legacy claimants might be moved for remainder of this year?
I ask this because it would seem to make no sense to migrate SG claimants this year then have the administrative burden of moving them again within the UC system, to adapt their situations to the new rules governing the relevant descriptors of WCA which are changing and potentially downgrading them to a lower group.
Or, would the DWP simply be able to apply the medical information they hold on their systems for claimants in those descriptors that are changing, just by updating their claim criteria without a fresh review or medical? After all, claimants are advised to always report changes in condition and keep their info current as it were. Or is it likely the DWP would need to send claimants for fresh reviews once these WCA changes come on stream in 2025 to ensure matters run smoothly from a legal viewpoint?
I have to admit that in my case I have fresh medical issues in addition to deterioration of the issues for which I originally claimed ESA, since I was last reviewed quite a few years ago, and although the DWP are aware of these issues re PIP and before that DLA, I didn't think to update ESA themselves as I have long been in SG and it would not have led to my getting a higher award and certainly not to being downgraded to a lesser one, so it seemed academic. I envisage that when I get the migration notice and it asks if I have any health conditions which might mean I struggle in the job market etc there will be an opportunity to relate this to them either via the online application form for UC or to any personal/job advisor at the initial interview. I haven't seen an example of the UC application form so don't know if it contains, like it's precursor the ESA 50 paper form, a box for giving additional information.

Thanks Gary That clears most of it up. I take it from your reply that even if migrated post 2025 when new WCA criteria are up and running I would go into UC LCWRA group automatically by virtue of my being in SG of ESA currently. Then I would need a medical review to determine my status going forward. Have I interpreted that correctly?

What I meant by the last question Gary is would a claimant need to undergo a medical review regardless of when the migration takes place ( paper or face 2 face) before any new status is decided either under current criteria or post 2025 under proposed new criteria? Hope that makes sense though I appreciate there might not be definitive advice available on this scenario yet.