Patrick Lumumba was arrested on 6th November.
A warrant for Guede's arrest was not issued until 17/18th November.
Obviously when they arrested Patrick (because of AK's interrogation and statement to the police) they did not have DNA results back.
When they got the DNA results back there was overwhelming evidence that Guede had been in the room where the murder had taken place and had had some sexual contact with the victim.
At that point there was no evidence that Knox or Sollecito had been in the room where the murder took place. There was also no evidence that PL had been there. The released PL. They did not release AK and RS.
The prosecutor had already made statements that 3 people were involved, that it was a sexual crime.
Guede made a call to a friend from germany and said he had been at the house but he did not mention that Sollecito or knox were there. he said "Listen, you know I knew those girls, I knew them both, Meredith and Amanda, but nothing more, you know that. I've been to their house twice, the last time a few days before all this business, but I didn't do anything. I have nothing to do with this business. I wasn't there that evening. If they have found my fingerprints it means I must have left them there before"