I don't think 93% is a-only grade. Since I feel it's very hard to numerically judge a product that is looked at from a huge number of selling factors I give my personal opinion about this;
Since technically Live Resin's products are perfect, I can not give a percent grade just upon that. I give my opinion based upon why would I buy this product. Since they pull out stuff unimaginable before in resin as well as molding/casting process I want more and more the more I see their products.
The level of LR products details is stunning and I've become used to expect a lot from them. This is why I perhaps gave a slightly lower score this time. But please read the review and don't get hung up on a number.
Hopefully you don't see anything wrong with my opinion and answer.
Thanks and hopefully this answers your question a bit.