But some of the best players in the League are the so called 'smaller and weaker' players.
Examples off the top of my head of players with a similar build to Messi.
Nasri
Fabregas
Nani
Suarez
Modric
Lennon
Benayoun
Arshavin
Van Der Vaart
Also, when Ronaldo went to Man United, he was a skinny little show pony. But the Premier League + intensive weight training beefed him up and turned him into the player he is now.
Your argument sucks, because there are plenty of smaller/weaker players already in the EPL and have done very well.