I think I favour the other defintion I've seen...
1 Sheep = SD2 old
2 Sheep = SD2.51 late version
2.5 Sheep = Varies, sometimes SD2.8 maybe SD2.9 - this is where many "2 sheep" begin to choke (sometimes passing with AWS/EFM correction, often not)
3 Sheep = in the "sheep test", not susceptible to ANY weak sector patterns.
One thing about AWS and other tricks, it seems they are nowhere near a 100% solution, going maybe one step higher if you're lucky, but often fai8ling to deliver.