He had a great game for Leicester in the Cup final v Chelsea. The experienced CB was injured and had to go off, Fofana was excellent in the heart of the defence.
Barca could not afford him.
Fofana as CB R and Tapsoba as CB L would be great when playing 3 at the back. They can both play center as well.
In the speed dept, they're much faster than both Lengsam and Pikeman. They'd provide about 75% boost in Takl+Int per 90 and being so young, there's plenty of room for improvement in other areas where they're already pretty good.
Aerials won being the main area where Pique still dominates. Then again, there's the risk he injures himself on the landing.
Lenglet is a good passer and I've seen him pull some cool through-balls but he tends to turn nutso when pressure gets high: 0.07 RC and 0.07 Pen conceded per 90. Would be interesting to get the FKs conceded stats too