As King_Messi said, Father time has not been too kind to him.
That's why I'm not on board with the idea that a DM successor to Busi has to be just like him. I would love to have a DM who is not only strong on the ball but also someone that can provide much more energy, pace, and steel while the likes of Arthur, FDJ, Puig, Alena, etc doing more of the heavy lifting with the ball.
Not talking about a complete destroyer in the vein of Casemiro for Real but someone perhaps like Yaya Toure was when he was here.