OK, well first of all, he certainly does seem noble in his loyalty to her, if we can take him at his word. It is amazing that having known her for such a short time, (a matter of days) he would not betray her in order to save himself.
And it is clear that he knew himself to be secondary in this case, and overshadowed by her in all ways. (which was true enough, in both the media and in the court).
Reading between the lines, I wonder if he felt that his meeting her was in fact "a fatal attraction"? He seems passive and as though Knox may indeed have served as the catalyst - projection for him; she may have received his projection, becoming a kind of anima-figure or femme fatale in the truest sense of the word.
My biggest problem with all of this is the short time-span, the brevity of the time Knox knew Meredith (one month) and the shorter time she knew Sollecito ( 6 days) prior to the murder.
The psychological constellation of Knox, Sollecito, Guede, and Kercher ressonates with spirit and intuition: Especially for me, the kind of masculine aura exuded by Knox, and the feminine one by Sollecito. I can see some repressed sexual stuff coming into play in such a fusion.
But the time seems far too short for anything to have truly taken root and germinated. Unless of course there was a kind of "time dilation" due to the exotic nature of Perugia, and the transitory feeling there?
It's odd, I have problems both with finding them fully guilty, AND with writing them off as a couple of rail-roaded kids. It's as if I am hovering in some middle ground here.... Of course if taken at his word, Sollecito does seem to indicate consciousness of their innocence.....Hope this critique was at least slightly helpful for you.