Why are some in form players not bringing their best to El Tri? It goes both ways. If you've seen a player that has brought their best to El Tri, but are in a bad spell, than the coach has to decide if the player's potential and upside merit the risk of trying to bring the player back in form by giving them minutes. Aguirre did this for Gio and Vela in 2010 when neither player was getting playing time with their respective clubs Tottenham and Arsenal. However, Aguirre's risk paid off and qualification came. You're talking about Chicharito in this case. Well, clearly Vucetich, just as everyone else, has seen what he has done with El Tri. He isn't in form, but just as Aguirre, he has to ask himself is it worth the risk to try to keep a player in form that is out of form because he knows what he can do and has done? Well, Vucetich thinks it is worth the risk, just as Aguirre thought it was worth the risk when playing an out of form Gio and Vela.
Now back to the counter-argument. Why are some players who are in form with their clubs not bringing their best to the national team? Ayala, clearly is one of those players. He was inclusive on the first goal that was allowed against Costa Rica together with Miguel Layun and one against Panama. Torrado doesn't start, but why is he being called up? Good with Azul, but bad with El Tri. Look at Aquino. He isn't good with El Tri, so far, but he is superb with Villareal.