Crouch is very good with the ball on the ground, and actually has a brain. He plays people in, and his movement is good. Holt is an old fashioned centre forward, and not much more. Plus Crouch is proven with England, which is exactly the same argument people are using for Defoe.
Welbeck offers something nobody else offers - he actually has decent feet, plays very well in front of the defense, and can link fantastically with the midfield. Sturridge I'm pretty easy on, but I'd rather take him over Defoe because he's the best part of 10 years younger. We're not going to win the Euros, so why not build for the future.
Do you watch football, at all? Welbeck doesn't offer any of that, he's poor, he has poor feet, plays very poorly as the front man and his link up play with midfield is ****.
Crouch is also none of the things you said, including not proven for England, he's proven he can score against such teams as Jamaica and, Mongolia, and a whole host of other teams that both won't be at the Euro's and won't have any bearing on latter stages of the competition.
It's like saying Franny Jeffers scored 3 hatricks for Arsenal, against Barnet, Aldershot and Torquay, therefore he's proven for Arsenal..........
Crouch is poo, his movement is poor, he's not inteligent with the ball, he's slow, he's incredibly weak and he'll more likely get called for all his climbing in the Euro's than for Stoke in the prem league.
As for your assessement of Holt, this is another player you haven't seen play this year, he is not an old fashioned centre forward, HE is the player with fantastic movement, a footballing brain and good with his feet. He's just better in the air, stronger and a more effective battering ram AS WELL.