There is nothing to clear him of, because he has never been named a POI, and as far as I know, his name has never even been reported by the media. I'm pretty sure it only came out because someone sleuthed JR's friends on Facebook and determined he was a friend and in Bloomington from the Runcible Spoon tweet. So, let's say he is the out of town visitor mentioned by HT -- There are still two possibilities: Either, he was in town but not with JR / LS that night. Or, everyone involved is protecting his identity and he has somehow managed to stay out of the whole thing.
I don't know the answer, but I think the first case seems more likely.
The quote from Salzmann is puzzling. How would he know how many people saw Lauren after Corey, when Corey doesn't remember anything and MB claims he didn't leave with her. I haven't given it too much thought though, based on other misleading things that Salzmann has claimed on behalf of his client.