He's freelanced for many papers (more often the Mirror), but quite clearly has close connections at the Mail. He has written pieces for the Mail in the run up to the acquittals. And I would have to agree with you that the Mail's stance on the acquittals very likely has some link to existing relationships with John Kercher. There appears to be little other way to explain
the sheer perversity of the animosity expressed in today's opinion piece by Amanda Platell in that paper - provocatively and extraordinarily entitled "What is it about Amanda Knox that so chills the blood?"
http://www.dailymail.co.uk/debate/article-2045078/What-Amanda-Knox-chills-blood.html#ixzz1ZoQxJcNO
IIRC, the Mail's front-page headline in its first editions also struck a curious chord which implied that there was something suspect with the verdict. If John Kercher's influence and connections did indeed have anything to do with the Mail's reporting on the acquittals, then that would shock and surprise me, and would massively diminish any respect for John Kercher and his dignity/decency. He might have had nothing to do with it of course, but......