Suspect:
I think a suspect slot is a bit of a meme without an obvious suspect on the table. There's no point doing Reun considering how far it was from actually getting banned in the recent suspect, and I don't think there is anything else close to agreed upon. It has been suggested that you could swap out the banned suspect every round / every couple of rounds but honestly I think getting 4-12 games max of a mini-format is pretty meaningless, high variance gobbledygook, especially when its unlikely to be 8 SPL-calibre builders playing the slot. If we could agree on one obvious suspect and we had a group of very very strong BWers coming forward to say they'd properly build in the format for the entire tournament run then sure, maybe its valuable, but anything other than this would make the slot a joke imo.
BW1:
BW1 is interesting but very underdeveloped at this stage, unfortunately I think this tournament comes 6 months too soon for it. There's only a small handful of players who appear to properly understand the tier to teambuild in it and, like with the suspect slot, no guarantee they even play BW1 in a team tour when they are BW OU and UU mainers. Maybe this tournament could be a springboard for the format but the quality of the playerbase, teambuilding, and gameplay I've seen of it so far is really really mixed and unless big names sign up to play it I would worry that representation does more harm than good re: meta development.
Proposal - second UU slot:
My boomer hot-take is that in terms of meta development, history, and activity the BW tiers tends to feel like OU > UU > Ubers > the rest, and I think UU sharing equal weight as some tiers that were made 5 years ago kinda does a disservice to how established the UU meta is + how many people show in an interest in it. In the BW discords I frequent, the majority of activity in the lower tier channels is about UU and Ubers, I think they just have a far more natural draw as "the first lower tier" and "the banlist tier", in a way that "the 4th lower tier" is just never going to match, inherently. I don't mean that as an insult to people playing RU and below but the tiers do just tend to get more niche as you go down, with ZU being an apparent exception considering its weird tournament history.
Again, I don't really want to come across as gatekeep-y but 50%+ of the roster being RU and below with tiny playerbases does feel odd when Ubers and UU in particular appear to attract interest all year round. I think if we have slots that are up for grabs we should really be considering strengthing the bigger lower tiers (Ubers/UU) rather than pushing for inclusion of increasingly niche metagames.
Personal preference:
1. BW Ubers
2. BW OU
3. BW OU
4. BW OU (maybe BW1)
5. BW UU
6. BW UU
7. BW RU
8. BW NU
9. BW PU or ZU
10. BW LC