Mark Goodacre's third Gospel book

Last week Mark Goodacre announced his book on John, The Fourth Synoptic Gospel. I'll lay out what I expect to find in such a study before glancing at it.

I expect Goodacre to explain how John uses Mark (the earliest complete Gospel) as opposed to Matthew/Luke, and why. I also would like to see how John handles Luke versus the noncanonical scraps: looking here at Thomas, the Petrine fragments, and the Egerton Papyrus.

Presently I doubt we have enough primary sources to tell which of them John was using. I don't think Luke-Acts even existed until very late in the Apostolic era; the earliest Patristics pull from the Petrine tradition (I'd argue, from the Gospel of Peter of which we presently own only the Passion). Luke became important because Marcion was touting it, forcing all the Matthew and Peter people to scramble.

The argument I'd like to see addressed - if we're going down the road of John the Last Gospel - is whether the Gospel of John was reacting most-forcefully against the Gospel of Peter (rather than, of Mark). Because Peter is anything but the hero of John 1-20.