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Bottom of the NinthThere are other alterations and flaws that may not be detected by viewing the card inside a holder, hence the reason cards are graded outside of protectos and lucite holders. All of the grading companies are aware their competitors make mistakes. I am sure they do not always rely solely on a viewing of the card inside of the holder in deciding to cross the card.
I take cards graded by PSA and SGC to GAI all of the time for cross over. Baker does not look at the card and say, "OK, PSA says this is a 7, I have no issue with it. Now it is a GAI 7." On many instances he says he needs to see the card out of the holder before issuing an opinion. I then assume the risk by giving the "ok" to break a card out that he might conclude is not worthy of the cross over.