Tbh I've not watched Segunda much this season.
1. Not sure how to compare him with Vallejo but looks to be highly rated amongst big clubs. Juve and RM have both shown interest alongside likes of Villarreal and Sevilla. He's apparently one of Monchi's primary targets for January and he's more usually right than wrong. No idea if he's ready to step right in if Kounde is sold in January but Sevilla doesn't have much CB depth behind Kounde and D.Carlos so could get some good playing time if he ends up there.
Even in our current situation I think we can do a lot worse than spend 6-8m on Frances. At least he should be an improvement (maybe not immediate but with a higher longterm potential) over someone like Mingueza who we can probably sell for similar money. He's also versatile and apparently can play both FB positions alongside CB.
2. Looks interesting but not sure if we really have a spot for him in this team already full of young midfielders. Las Palmas is also working to renew his contract and raise release clause to 30m (currently 10m).
3. Samu Costa
https://www.transfermarkt.com/samu-costa/profil/spieler/657430 looked quite good to me last season but with Almeria very likely to be promoted and having a rich owner probably won't need to sell for cheap.
"he's got a bit of a bastard about him" - not a choir boy so we're probably not interested anyway
4. Haven't watched him much but sure, why not steal a talent away from Madrid? Don't see it happening though.
5. I've read Gomez made a great transformation to LB but not watched him yet. Surely could be worth a consideration for affordable price but I really think we need someone who's ready to step in immediately as I'm tired to see Alba as unquestionable starter. And might be just me but I also believe Balde (who has shown a loyalty to stay and wait for his opportunities) deserves a chance before we bring back another former player in front of him. Unless that player would be a proven (close to) world class player which Gomez is clearly not yet (and probably never will be) and I also don't rate Grimaldo as high as some other La Masia guys. With overall lack of quality LBs on the market over the years if he'd be really that good he shouldn't still be playing at Benfica. Yeah, he's consistently linked to bigger clubs but for some reason he's still there and is also not exactly a youngster anymore at 26.