How does speculation from some random person online who isn't honest enough to admit he has no inside information considered factual enough for you to have an opinion on whether Apple should use the A4?
Clearly the A4 is far more powerful than the CPU in the GS -- this is obvious looking at videos of the products-- thus if they put an A4 in the next iPhone it would be a huge improvement.
Yet you want a Cortex-A9, which you (wrongly because you don't actually know) presume is not in the iPad. But you have no real reason. To you, a Cortex-A9 is just something people snidely said that apple should be using but isn't.... people who, in my experience, haven't the first clue.
I happen to have some inside information (available to all iPhone developers) that I won't reveal but that is consistent with the A4 having a Cortex-A9, not that it actually matters at all.
The A4 is not an off the shelf ARM CPU, it is a custom design.
Demanding that apple forgoe the advantages of a custom design and use an off the shelf CPU is shortsited and silly.