No, there isn't.
Regarding the "multiple knives" issue: it's been pointed out very many times that all the knife woulds could have been caused by a single medium-sized, narrow-bladed, non-serrated knife. The ONLY reason why the prosecution and the court came to the "two or more knives" conclusion was that they were convinced that Sollecito's kitchen knife was one of the murder weapons, and THIS knife is incompatible with two of the knife wounds.
If Sollecito's kitchen knife gets discredited in the appeal, then there's no reason whatsoever to believe that more than one knife was involved. And what's more, it's utterly illogical to even suppose that more than one knife was involved. After all, if this had been a three-way group attack, with each of the assailants carrying knives, it would make absolutely no sense for two (or all three) of the assailants to place his/her knife at Meredith's throat. This would mean that their knives would have been moving in close proximity to each other, thereby greatly increasing the chances of one being injured by the other's knife. I'd suggest that if each assailant were carrying a knife, then each would have placed the knife to a different part of Meredith's body - perhaps neck, chest and back. In this way, not only would they minimise the chances of injuring each other, but it would also be a far more effective way to control Meredith. Of course, all this is moot, because just one person - handling just one knife - was responsible for this murder.
On this issue of "multiple bruises", I've already pointed out that this is a misleading (and willful) attempt to suggest that Meredith was involved in a protracted violent struggle. This is not true. The autopsy report is explicit in its description of the surface marks and bruises on Meredith's body. In most cases (outside of the choke hold on the neck), it describes them as "barely noticeable", "small" or "slight", and it also points out that there were no visible injuries to her chest, abdomen or lower limbs. See the Massei Report, English translation, pp110-112 for details.