I won't compare their football knowledge but it's obvious why is Senna playing ahead of Xabi.
I've been following Senna today and he spends most of the time defending, with absolutely no involvement in attack.
It would be silly if Aragones started with Alonso, Xavi and Iniesta in the center since none of them is a ball winner while Senna's job in Spain is exactly that.
That's why he's playing and Xabi isn't.
I know all that. I'm a Liverpool fan, remember.
My point is he's been pretty crappy at his job. It's obvious they are two different players. But geez Marcos, after you tackle the ball don't give it to the guys in yellow.
Xabi needs to be playing in the center with Senna, with Xavi out wide. Xavi and Iniesta are both getting knocked off the ball, limiting Spain's presence in midfield and their possession of the ball. Iniesta hasn't strung a pass together all day, so he gets the ax.