I have to disagree. You're good because... you're just good. Not because you used Google to locate some ghost. Your skill is a credit to your actions in the game and not some number.
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Ghosts and fragments won't get you close to 4600
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Most of the grimoire is obtained by normal play. Factor that in with the roughly 1000 points from ghost and fragments and you're hunting for and you have a decent score.
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Still to get 4600+ you need to be dedicated
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No doubt, dedication and motivation are really what are needed for a high grimoire. I still wouldn't say that it determines skill.