Hey, guys. I'm from Belgium. And will give you my honest opinion about LDD.
Dendoncker can be a great buy or can be a complete miss. But for 13,3M it's an easy buy imo.
As a CDM he is incredibly talented. When he came up at that position in Anderlecht, it was one of the best young CDM's I had seen in my life. In the youth teams, he was never the biggest talent. That's why he worked hard to get at an extremely good level for a 19 year old. But Anderlecht is bad at managing young players, so his mentality went downhill once he was considered as one of the stars.
On top of that, people were trying to make him a CB. And he absolutely lacks the qualities to play decent at that position. He only has the right height for that, that's all. If the management succeeds in changing his mentality and plays him at CDM. 13,3M is absolutely ridiculous because he will go to a 60M worth in no time. If they can't handle him right and play him at the CB, he will fail big time.
Good luck with him guys!