If they promote it as being the Shark pattern, and 1/4 of the bowlers know that it isn't, while 3/4 of the bowlers still think it is the Shark. I would say the 1/4 of the people that know it's a different pattern will have an advantage, simply because they know what others don't. The 3/4 would be expecting the pattern to break down like the Shark should, play like the Shark should..and it doesn't.
You can say that everyone is bowling on the same pattern till your blue in the face, but if people expect something and it's completely different entirely, they're instantly confused and many wouldn't know what to do or how to handle their ball reading completely different then the Shark should.
With that said, this is why I don't listen to pre-tournament gossip. Go out and roll your ball, find out where your shot is, how the pattern is laid down, etc.
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Big B > *