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I cant comment on the crown's 'job', I can only see that the BGA tappet has a more pronounced crown. It isnt offset Gelbster, just me struggling to capture the image in a phone!
The tappet would only leak down and then get hammered in if the relief valve element was gunged up. I have had these to pieces and when you put them back together they spring about all over, but you fill this tappet in these pictures up with oil by depressing the tiny ball/spring and then it allows oil in, and it becomes pretty solid....how you need it.
I assume the ball depressing happens with engine oil pressure in situ, but like I say if the tiny relief mechanism is blocked with old oil, it wont work effectively.
This is all my take on the whole thing, nothing certain here.
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