Its a joke to be honest, his complete loss of pace was SO obvious in his last year(two years really) at Pompie, he was so easily turned and when you're just ahead its far easier to outmuscle someone as you have the advantage. His immense strength in the old days was actually on a fairly fast player, when you're behind the strength is fairly useless as anything but shoulder to shoulder you can't really exert your strength.
He's shot, he's been on the decline for years, if he wasn't good enough when he was playing week in week out, how on earth can he be good enough having played one match this season, clearly won't be match fit and won't be good enough if he was match fit. Aren't we already throwing wages down the drain on the likes of Silvestre who we refuse to play.
As for mentality and bringing something to the club, well he's had what you assume was a breakdown, walked out on his contract for unknown reasons, supposedly moving to Europe, ended up on a huge pay packet at Pompie thanks to no transfer fee in one of the most ridiculous things to happen under Wenger at the time, when frankly we should have been recouping 10mil + on him rather than losing him for nothing.
INsisted on going to a league 2 club saying he'd do great there, walked out again after one game, sorry but whats that GREED and lack of commitment going to do to help our kids develope into better players/people?
For a club thats lost quite a few fantastic players due to our ridiculous over 30's policy, we're bringing in ultra expensive older people who don't play, while still being stingy over contracts for our older players, few that there are.
The simple fact is we don't need desparate cover, we need an EQUALLY good 3rd centre back so we can actually rotate our defence, keep the 3rd CB in some form and the rotation should help stop players getting injured in the first place. Why have a whole host of backup players who aren't good enough for the first team and never play them?
Lets see the nonsense as we spend the money Wenger is willing to, on an expensive striker despite having basically a dozen central attacking players at this point, and then get in a free but probably highish wage CB whose not good enough, and not bother with wingers, or a real CB who might actually be good enough, hell, or a decent ruddy keeper.