Malbim: This is a Mashal that all his servants and officers and all the nations will veer from him. Daniel wanted to say only what will happen to the king's body. It is understood that during his lunacy, all will veer from him. Since the dream said not to cut the root and leave it in the ground, it was understood that the kingship will not cease. Daniel did not need to tell this. He did not need to explain "his heart will be different than people's hearts" - this is included in "his portion was with the Chayos" (12). He did not explain "his portion is with the Chayos in grass" (11), that he will be like an animal in every way.