We need our own scout @Fred.
Capoue started out really strongly for Toulouse 4-5 years back, and deservedly became the center of attention for lots of top European sides. He hasnt been able to develop as much as people(myself included) expected him to though. However, some may argue that one of the reasons he's stagnated is because hes had to fill in so many different positions the past couple of years. He's shown himself to be quite versatile, and actually playued the CB role quite well last season.
That being said, whenever I've seen him this year, which admittedly isn't that much, however I still do read a lot about Ligue games; he's been quite the performer. He's a very strong player physically, he's a good tackler, although he could be reckless at times. Technically he isn't bad, and he's improved a lot offensively this season. hes scored quite a few goals this season, more than he does usually.
For a big team, he'd be quite a gamble though, not sure if he'd be good enough.