Cesc played in the under 17 spanish world cup and got noticed in that.He chose arsenal over barca as he knew he wont get much game time.
yep merida is another production of the barca youth system.
Not exactly. Under Spanish law Barca could not offer him a pro deal till he turned 18. That's how Arsenal were able to sign him so cheap and easily. That's the same way Arsenal sign most of their youngsters. They use the fact that in continental Europe it's illegal to offer a professional contract till the player turns 18 while it's it's legal in England.