Said it already, he's a talker. Look at the latest video of Ruud taking the training. Who is there having a chat with him while they're tying up their boots?
He gets in the managers ear and talks himself in. That's why someone like Okoli, who I'll assume is quieter and isn't putting himself in front of Ruud outside the training pitch is overlooked for the yes man. You've likely seen them in your own workplace. They talk a great game.