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T206Collector...are often based on 2 spider wrinkles. I see two in your scan -- one where you describe it, and another going horizontally across the card into Cobb's face under his right eye.
Spider wrinkles are notoriously difficult to spot in scans -- which is why 3rd party grading is so important in internet transactions.
This is the example of any SGC 30 with spider wrinkles that I always refer to:
http://www.sgccardregistry.com/images.asp?cardid=28217&usetid=1015
Please keep in mind that grading is a pyramid -- all 10's will look alike, but as you go down the grading scale, the reasons for a grade will vary, with 1's carrying the most variables in grade. An SGC 30/Good/2 can have any number of reasons for that grade including two hugely visible creases and two spider wrinkles. SGC will not give a 40 to cards with 2 creases or spider wrinkles, generally.