Of course not-but I employed occums razor and I think the simplest explanation is not that the killer changed clothes or in some other way took all the evidence of a bloody crime off him and slept in the park bench but that the locals much like some of the people on these boards-jumped to conclusions and saw someone they liked for the crime and called it in. Wrong place wrong time.
When I say I trust the Germans know what they are doing-from what I have seen they have conducted themselves admirably and I didn't see where they said the guy they detained was the real guy. I just saw they said they have someone being questioned. I can't speak on their security protocols but I would imagine the person who is in charge of security for this event may not be the same person leading the investigation.
As the Americans like to say after a cop kills a black
"Let's just wait until the investigation is concluded before jumping to conclusions okay guys?"