I think you are missing the point here, it isn't about what he brings but what he doesn't.
-This squad is terrible, there is no way around that, and we have so many holes that we need to fill just to be able to compete with well oiled machines like Sociedad and Seville for CL spot. A DM, an athletic experienced CB, a quick wingers, a goal scorers and a GK are all areas of immediate need.
-No one is expecting us to address half of those issues in winter, but at least trying to fix couple of those will help massively.
-We have 23 squad players before Alves, all whom under contract and unlikely to accept to be phased out in January. Alves is player 24.
-Alves simply doesn't fix any of this, he isn't quick, he isn't a true winger and unable to play as RB anymore either. More of RWB. He isn't a CB, DM, GK, goal scorer.
-His signings follows the same logic of Luuk, we were only capable of getting a player in last minute of transfer window, we got Luuk for free, only for less than a season, we aren't even paying his full wages. Low risk signing because we are beggars
-Unlike Luuk we have time to think about our possibilities in the winter, and we came in with Alves.
-I doubt anyone would have defended Alves if his history was tied to another club, let's say he was playing for a Juve/Milan/Liverpool/Manu side in his prime and had same success, would anyone defend the signing? I honestly doubt it. There is a lot of PR/Nostalgia/nepotism in the deal.
-Alves is not really a leader and was never one of the team captains anywhere he played iirc, a winner maybe but not a leader. There is a distinction here.
The Alves deal simply says our ambitions and planning for this season is on Luuk de Jong level and give us no hope it would improve to Braithwaite one