When the paternity story began, it appeared pretty quickly that Summer did NOT belong to Nick. Now they are making it appear that Jack is NOT Summers father.
I do not think the paternity is truly established just yet.
Its moving to quickly.
I think the paternity still could go either way.
I do however agree with whomever it was that said thecreation of the paternity test was never really about changing Summers paternity, but that it was to bring the conclusion of Phyllis.
I have said and will always say the paternity story waws only designed to have one last Phyllis/Sharon fan war before its over.
Originally the spoilers read that Nick was going to have great consequences to his actions, but so far I have seen Nick suffer no consequences at all. They are making it all a Sharon issue.
So if anything they are planning on turning Sharon into the new villain since the best of the best villains will now be in a coma.