I have had this position for three years (and got banned from a guilter site for it) - perhaps a little 'confirmation bias' against someone who doesn't take your stance
All I can say is that if the best you can come up with after 3 years is "how did he know nothing had been taken?" then I'm not impressed. It's not evidence of anything, other than someone looking for wrongdoing were there is none. Your "involvementer" stance has even less substance than the "guilter" one; there is nothing to support it other than the false attraction of the middle ground.
The case is very simple: Rudy Guede broke in through Filomena's window intending to burgle the place but was interrupted by Meredith coming home. He then took it into his head to rape her at knife-point, but ended up fatally stabbing her. He then left in a hurry, taking only money and Meredith's phones - as things like laptops would be far too identifiable.
The only way Amanda and Raffaele were "involved" is that they were the first 2 people who came upon the scene the next day, and after some hesitation called the police. All of their supposedly "odd" behaviour and statements afterwards are simply the result of confusion, grief and anxiety - all the people who think they know how "innocent" people are supposed to react in a situation like that of extreme stress, are just talking nonsense.
The actions taken by the police and prosecution afterwards is where the case gets complicated, but even that has a clear interpretation in the light of other miscarriages of justice. This wouldn't be the first case in which police have wrongly arrested someone who happened to be at the scene when the crime was discovered, and then shown complete tunnel vision in centring the investigation around their initial hasty suspicions.
As for "taking a stance", I didn't do this at the beginning. I didn't
choose to support the innocent side and then look for arguments to support it; I waited to see what the evidence was. Having said that, it didn't take me long to see that the pro-guilt side didn't have very much at all, apart from bleating "innocent people don't do that!" - the few items of actual evidence (the kitchen knife, the bra-clasp and Curatolo) were notably thin and implausible. AK and RS are neither killers nor "involved" - they were just unlucky to be the first people in the spotlights of a police force who had no idea how to conduct a murder investigation.