The pools at the trophy are definitely slightly more of a toss up with a Host and 6 regional qualifiers rather than an explicit year to year continuation that the Cup does.
Theoretically, I think the teams have been seeded like this:
1 - Japan - Relegated
2 - Netherlands - Spain Promoted in 2023, Rugby Europe Replacement
3 - Uruguay - 2nd place finish 2023
4 - Scotland - 3rd place finish 2023
5 - Samoa - 4th place finish 2023
6 - Kenya - 6th place finish 2023
7 - USA - 7th place finish 2023
8 - Hong Kong - 8th place finish 2023
Then 1,4,5,8 and 2,3,6,7 become the pools.
The USA have then come in and overperformed and Samoa have fronted up with some abysmal performances. (presumably from a domestic squad, although I haven't seen that confirmed anywhere), making it look like B has been super competitive and A has been a waste of time, despite the seeding being... I won't say accurate, but well reasoned enough to start with.