Let me rephrase it. Young prodigy from South America who had a few good seasons in Serie A, and seems to be a perfect winger for Barcelona at the time. You think that's just a coincidence? Why should one do well and the other fail, when they both have a lot of similar attributes?
Pace, skill, goals, dribles, magic.
So... everything that Sanchez provided in Udinese? And a lot of what he still provides today? I don't know why you think Alexis has proven nothing against good or great teams, he was one of our best players in the first game against Atletico, he was good against Malaga, he beasted it up against Madrid several seasons ago... He's finally getting back to the form everyone expected from him when he was bought, and selling him now would be useless.
And as much as I love Tello... What has he proven against good teams? What will he offer that Alexis doesn't?
Less passing around and more speed
All right, so he's pacier. I'll agree with that in a heartbeat. But what do you mean by "less passing around"? Sanchez has been taking players on constantly since the start of last season, just because he doesn't try to dribble every time doesn't mean he just backpasses whenever he gets the ball.