I used him nearly 200 games (mostly with shadow) in WL and in SB.
I played Vertongen with him, and now Bailly
Bailly is definitely better, but in Jan's case I'm not sure
I think worth a trial.
-His heading (mostly in defence because mostly stay in the back, even at corner)
-His vision off the ball
-He can play CDM
-His composure (could be better, but it's enough)
-Value for Money
-His pace (without shadow, it's a pain in the back, even with shadow not that fast, just enough)
-Sometimes just miss the through ball, just step over it
-In this stage of the game, you can easily buy better