
False, false and false :-)
No joe, the staffords skull does not crack or split.
I guess the 'look' you speak of and the fallacy that the skull cracks could come from the fact that when a stafford is maturing his / her muscles mature and form with him / her making an 'm' shape at the top of the head.
Maturity happens at very different times depending on each dog. My bitch did not mature (i.e. reach her full height/weight etc) until she was almost 3 years old.
My boy is just over 2 years old and still isn't quite there yet.
Have you contacted your local breed club? They can offer a lot of useful information.
To find your local club, look here
http://www.staffords.co.uk/ and then click on breed clubs to find your nearest.
There are many many useful stafford books available too.
hth
Tracey