I take it you are not bothered about promotion then ?
Brooks no where near consistant enough, can look good in flashes but can equally be anonymous in games.
Seriki is not defensively good enough yet, plus has fitness issues.
Arblaster I really hope he comes back the same player.
Oné not ready for a full season for a side hopefully challenging for promotion.
With the exception of Arblaster provided he comes back the same player all the others would make us weaker if we lost Hamer, Souza and Anel.
Brooks looks better as a sub rather than a starter, some players are like that, especially when they're younger as it allows them to have more explosive impacts against tired players.
I'm not a medical expert or anything like that, but I reckon Seriki's fitness issues this season are a product of that initial injury against Wrexham in August, hopefully he'll be fine after preseason.
He isn't the best defensively, but hopefully that will improve with time and experience.
Oné, a loan away would be beneficial to him as far as playing matches goes, but him staying as 4th choice wouldn't be a bad idea either, it depends on how much game time he'd get next season.
Arblaster, hopefully he comes back fresh, fit and ready to go.
We are going to be weaker if we lose Hamer, Anel and Souza, but we're in a good position to replace them, we'll be a favourite for promotion next season and that will help attract players.