Grade mystery… why Teddy Ballgame a 4?

[Belfast1933]

A local friend of mine connected yesterday (he’s much more experienced of a collector than me) and I was sharing these images of my ‘48 Leaf Ted Williams

I love this card - Ted as a young slugger, the colors from that set are so Andy Wharhol cool to me, etc.

But he asked and I could not answer why is this card graded only a 4? I never thought much about it - he was sure that it must mean that the card has a crease or wrinkle somewhere on it. So I gave it a very close look, tried to use a jewelers loupe, but for the life of me, I still can’t find the technical flaws

Thought I might post a few images here and see if any Net54’ers with a sharper eye than me might help me find Teddy’s flaws

Thanks for taking a look and Happy 4th to all!🇺🇸

Jeff