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You will never see Arcueid in 100% anyway, considering it would go against her own character altogether. That's why in Fuyuki's powerlevel chart, Arcueid in 100% mode is never mentioned, since it is, for the lack of better terms, impossible to occur.
Anyway, the holy grail only serve as a "vector" to call forth the Heroic Spirits from the Throne of Heroes in Akasha, while Masters serve as anchors for them to the world.
Past this point, the Holy Grail doesn't really do much about these, aside of collecting the defeated servants as prana mass.
There are a lot of "environmental" points that affect servants (such like terrain, classes etc) but generally speaking, they are as powerful as their past deeds/legends dictate so.
Of course, every Servants are "more powerful" due to their nature of Heroic Spirit, meaning they have to be dealt with conceptual weapon, instead of physical weapons. But such chance of nature doesn't mean they have a "boost" in its truest sense.
In the case of Gil, it is very unlikely he would be "less" powerful, especially that he doesn't have a "fame" bonus unlike Saber with Arthurian's legends.
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