You completely missed my point, though i guess i did word it pretty badly, so it's my bad on that one. Losing his composure affects how well he can apply his skills in CQC, yes, but it does not reduce those skills. I wasn't trying to say it would be irrelevant in a fight, i was trying to say that it's not an argument against his skill.
Okay first, Kanshou and Bakuya are not daggers. They're way too big for that. Second, do you really think that Archer can only fight with Kanshou and Bakuya? And third, this was already mentioned, but when Shirou copies a weapon, he also copies the skill of the original wielder. So when Shirou was fighting Gil in CQC with that long sword, he wasn't using his own skills in the first place, he was using the skills of a legendary hero.