Really don't buy the 'I specified a clean face' thing. Ok, a batmaker should be aiming to satisfy their customer's requirements, but let's say I ring up Streaky and ask him for a 1 stripe with no blemishes, 15 grains and no heartwood. Wouldn't be terribly surprised when he told me to stop dreaming!
Grade 1 is a very vague grading, which is why Crown or G1+ etc bats exist. Haven't seen any with knots or anything like that that would stop them being graded as G1. They'll play well I'm sure. I've had two filthy looking butterflies from B3 that have both been guns. Also when you know B3 are clearly pumping out bats like there's no tomorrow at the moment you can't expect every single one to be cream of the crop willow!