A life time of experience and research holds little weight against a random photo in his eyes. If the GBB Gull had killed the Osprey thee photographers would have posted the images of the former eating the latter but so far none have been posted.
To answer your first point. There is no evidence, whatsoever, that the interaction between the Osprey and the Heron would have ended in the death of the latter. On the second, and more contentious point, I happen to know that many people on here are working as, or have worked as professional ornithologists ( myself included ). I have been birdwatching for 53 years, on all continents, Great Skua are a north east Atlantic endemic and I, unlike you, live in the area. My knowledge of southern Skua taxa comes from a year on a research vessel in the south Atlantic, working in ornithological based conservation in New Zealand and, for my final taxon, Chilean Skua, my 6 week visit to Chile last year. To state that I and others have 'no experience apart from watching a few birds here and there' shows that, apart from searching out disparate pieces of 'proof' in an attempt to bolster your fixation with Skuas, Gulls, raptors and Ravens, you haven't bothered to do the most cursory research into the members on here. The knowledge gained by myself and others, over many years, has been gained in the field, with the birds themselves not, as yours appears to have been, by your statements, selectively extracted from books and the web. As for 'growing up' I would suggest you temper your language until you have garnered at least a tiny bit of knowledge that will enable you to discuss things with adults.
Chris