I know he had his air-tight alibi (well not so air-tight, since the detective made clear he wasn't entirely ruled out, they just couldn't find anything solid linking him to it. And that convinced me the detective probably suspects Rob too), but dude had red flags glaring all over the place that made me positive he's guilty as sin.
First, his smugly dropping how he studied criminology, which fit right in with his conveniently detailed timeline of getting gas and ensuring it was 45 minutes away and time-stapped. But what made me side-eye Rob the most was his whole scenario of how Patrice may have been killed that almost sounded as if he was inadvertently telling how he did it.
As they say, criminals often return to the scene of the crime, one to know what the police know but two, sometimes they're so impressed with in their minds, their cleverness, they almost want people to know what they did. Rob gave me arrogant and smug douchebag vibes. He'd very much be the type to want people to know he did it and got away with it and there was nothing they could do about it.
But his saying how Patrice wasn't necessarily killed that same day raised huge flags for me and perfectly explained how he could have done it. I think some people assume whatever happened to Pratrice happened in the shop or near the shop. But she could have just as easily been lured somewhere and killed later. I wonder if they ever did a thorough search of the house. Because that changing of locks the day after screamed someone with something to hide, who didn't want anyone but him getting in.
And even if Rob didn't kill Patrice, I don't know how dude expects anyone to not look at him sideways and believe he actually loved this woman, with how he treated her kid. Even if he and Pistol didn't get along, to change locks on a teenager the day after his mother, who you say you loved, who loved her son, goes missing, is some cold ass, hateful shit.