Why? Just because Sanchez has been average in his first few games in the Premier League? People put Benteke in their 'strongest 11' too, but I'm sure they don't mean the currently injured and not match fit version.
It's not crazy to think that Sanchez could become a much better player, once he gets a few more appearances under his belt. I just find it shocking that's all. Sanchez has done nothing of note in his entire career . He is 28 and has played for nobody , won very little (if anything?) and seems to be living off the fact that he is foreign and played at a world cup !
Westwood is 24 and has shown that he is more than capable of playing in this league . If anyone is going to get better it will be him. I don't find it shocking. Sanchez has played (well) in a World Cup. Before Westwood made 2 seasons worth of appearances with us, he was a nobody in League 1. Given time, Sanchez could be an excellent player. People might just be thinking/hoping that he lives up to his price tag (which, for the Villa of latd, was big).
I have seen enough of Sanchez to think he could very well prove to be decent for us when up to speed but it will be along side Westwood not instead of him IMO. That is the part I find shocking.