It's also quite difficult not to respond when your own posts are remotely commented upon, LOL.
If it is so, it's the "sheerest of sophistry" from the independent experts, who obviously felt the need to avoid using the term "compatible" with regard to the kitchen knife. Presumably that was in order to distinguish it from the "many other knives [which] are more compatible than this one". Maybe those glossing over the difference might want to ask themselves why, unlike many commenting on the case, the experts refused to call the knife "compatible".
The issue of the knife/knives is, to me, a microcosm of the whole investigation. If a murder victim is slashed and stabbed in one specific area of their body (here, the neck), then it's highly unlikely for the wounds to have been made by two separate knives. After all, for two assailants, each of whom is wielding a sharp knife, it's not only physically difficult for both assailants to place a knife at the victim's throat simultaneously - it's also potentially dangerous to the assailants, since they risk stabbing each other in any sort of struggle.
I would therefore argue that
if two or more knives were used in the attack on Meredith Kercher, they would have been placed (and subsequently used) on different parts of her body - one at the throat, certainly, but the other(s) in her ribs or back.
From this, it seems to me that the prosecutors followed a classic example of making the evidence fit a theory, when they got back a "positive" result on Sollecito's kitchen knife. The autopsy findings indicated that the two stabbing wounds and the slash wound on Meredith's neck were consistent with being made by the same narrow-bladed, non-serrated knife, but the slash wound - by its very nature - could actually have been made by any non-serrated knife, since it did not fully penetrate the skin and leave a blade profile. Furthermore, the bloody impression of a knife was found on Meredith's sheets - an impression that was compatible with a knife capable of causing all the wounds on Meredith's neck.
Now, common sense dictates that the same narrow-bladed non-serrated knife was responsible for all the neck wounds, and that it was wielded by a single person (whether or not others were restraining Meredith during the attack). But the prosecution now had a knife in their possession which they were convinced was used in the attack, and which furthermore linked to both Knox (DNA on the handle) and to a lesser degree Sollecito (the knife was from his apartment). But they had a problem: this knife was a relatively large, broad-bladed kitchen knife, which was definitely not responsible for the penetrating stab wounds on Meredith's neck. Nor, of course, did it match the blade impression left on Meredith's sheet. However, since it was non-serrated, it was "not incompatible" with the slashing wound.
And so we get to the illogical prosecution conclusion that two knives (at least) were held to Meredith's throat during the attack - it's the only way in which they can shoehorn the kitchen knife into the attack whilst acknowledging that another knife made the penetrating wounds and left the bloody impression on the sheet.
And there's one other thing: how and why did the kitchen knife from Sollecito's apartment get to the girls' cottage? None of the competing theories here makes much sense to me. Either Knox had taken to carrying an unsheathed large kitchen knife around in her handbag for personal protection; or the knife was taken over to the girls' house earlier that day for cooking; or it was taken over as part of a premeditated plan to "haze" or scare Meredith for some reason. But even if Knox felt she required protection, this would have been a completely unsuitable knife to choose; and the girls' cottage had a multitude of decent knives for cooking or "hazing" with.