Your first post you compared Davies' call up to the squad to the other three men. Your second post was essentially saying Davies' case is nothing like these because the guy is 33 years old and doesn't have the rest of his career ahead of him.
Yes, Taylor and Wheater have both been in the full squad, you said capped. Terminology is quite important.
Plus, you can hardly base the argument for Taylor and Wheater based on WHEN they were called up without looking at the circumstances which they have both faced since then. Both of their clubs were relegated to the Championship, where they chose to stay. I can't really speak much on Wheater because I don't know too much of him but I know Taylor suffered an injury plagued season last year, especially towards the latter ends of the season. Circumstances have worked against him for England. That's all, same I think, with Wheater. If they had both stayed in the Premiership? Maybe a very different story. I just think you picked two very poor examples to back up your argument. Something you seem to do a lot of based on what I have read of your opinions on football. It's frustrating.
And how could Capello call Taylor up to the squad three years ago? He hasn't been manager for that long.