i don't think the grading scale changed that much in 10 years...just that the old SGC regime merkle et al before derek grady was not very good graders and the current people at SGC don't want to be held accountable for those mistakes in the old holders.
from personal experience i place the "SG" slabs above GAI but below PSA in term of trust that the card is not altered (and we all know psa's rep).
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