Projection is Projection is Projection. Shirou's understanding and skill varies from route to route but it's the same magecraft.
The 5%/90% numbers were something daniel just made up to illustrate a point; i.e. Shirou sucks at things a lot more than Archer.
Caliburn moving on 'its own' is likely an example of him using the skill of the blade's wielder, albeit unconsciously.
It doesn't happen in the Shirou vs Gil fight, because the weapons from the Gate of Babylon are not Noble Phantasms, but "Prototypes of the Noble Phantasms" - in other words, the weapons before they were used by other people and became famous, so no skills to copy.
I can't say for sure, but I'd imagine replicating the wielder's skill comes under the "Reproducing the accumulated years" step.
The 5%/90% numbers were something daniel just made up to illustrate a point; i.e. Shirou sucks at things a lot more than Archer.
Caliburn moving on 'its own' is likely an example of him using the skill of the blade's wielder, albeit unconsciously.
It doesn't happen in the Shirou vs Gil fight, because the weapons from the Gate of Babylon are not Noble Phantasms, but "Prototypes of the Noble Phantasms" - in other words, the weapons before they were used by other people and became famous, so no skills to copy.
I can't say for sure, but I'd imagine replicating the wielder's skill comes under the "Reproducing the accumulated years" step.