A "reasonable narrative" for a senseless crime? How the hell should I know?
That little voice in your head that tells you when you are papering over a weak point in your own argument is trying to tell you something.
Guilters under pressure tend to retreat into arguing something like "So what if we have no motive? Sometimes there's no motive! So what if there is no evidence of our favoured killers in the murder room? Sometimes murderers leave no evidence! So what is we have no coherent narrative? Sometimes people commit senseless, random crimes!".
However they've made a fundamental error when they do this, because the've just admitted that they've lost the argument. Absence of evidence is not evidence of absence, but absence of evidence is absence of evidence. It's very, very hard to have proof beyond reasonable doubt that someone is guilty when you have no evidence, no motive and no narrative of how the crime could possibly have happened.
Whereas the Lone Wolf theory has motive, has evidence, has a coherent narrative of the crime and contradicts absolutely none of the hard evidence.
None of the three have solid alibis for, say - between 9:30 and 10:00PM. That, along with all the other evidence, leads me to guilty.
Guilters have to simply ignore outright the computer evidence put forward by the defence showing that there was computer activity all night - if they let that fact into their brains they would have to stop being guilters. However it's certainly worth flagging that the defence have released evidence taken from the log files on Raffaele's computer showing that the computer was in continuous use all night, so they do in fact have a very solid alibi both for the real TOD and the Massei/Christiani TOD.
However even if they didn't have this alibi recorded in ones and zeroes, there's the huge problem for the guilters that they have absolutely no plausible story as to why Knox and Sollecito would leave their nice, warm, private house at 9:30pm at night to go home to Knox's house, armed with a kitchen knife, and pick up Rudy Guede along the way using Knox's poor Italian and Guede's nigh-nonexistent English to join in a four-way orgy or Satanic ritual or "rape prank" or whatever other fantasy the guilters and prosecution are nurturing at the time.
No motive, no evidence, a very strong alibi and no narrative that's not pants-on-head crazy versus a clear motive, clear MO, ample proof Rudy was there at the time the murder happened, when he had no business being there, and a completely straightforward narrative of the crime. That ain't proof beyond reasonable doubt Knox and Sollecito did it. It's much closer to proof beyond reasonable doubt they could not possibly have been involved.