Originally Posted by Dr K Noisewater:
“I'm guessing Phil has discovered by now that Kathy's husband Gavin is Sharon's father but because Kathy and Gavin are supposed to be dead he obviously cannot afford to have Sharon find out. This Gordon bloke was to serve as a distraction. He wanted Sharon to take one look at him and reject him, return to Walford and drop the search altogether.”
I believe this too. It's too much of a coincidence that Sharon's father is called Gavin, whilst Kathy is secretly meeting Phil and mentioning her Gavin.