Did anyone else see it this way?
The first Archer, in the Fate route, was the same Shirou as the one he met when he was summoned.
The second Archer, in the Unlimited Blade Works route, was actually the Shirou from Fate route that ended up the way he did. After that, the Shirou that was warned in Unlimited Blade Works, did not drop his ideals and took the exact same path that his former self did. It may had been a different path but the goal was the same. I have no doubt that he would agree to become a heroic-spirit in order to protect the world after his death.
In Heaven's Feel route, there is a scene where Archer covers Tohsaka (where Shirou loses his hands) and gets fatally injured. In that scene Archer plays with Rin's hair in an intimate way (not exactly sure what happened there but it was hinted that he felt intimate towards her). Furthermore, Shirou had a dream of him having sex with Tohsaka in his classroom and that would fit Archer's memories, if he is the Archer from Unlimited Blade Works. The only Shirou that didn't end up as Archer and met his happy ending is the one in Heaven's Feel who threw his ideals away for the one he loved.
That is about it.
How did you see it?