Maybe I’m just face-blind or being dense but the photos from the scene of the crime look like a different dude than the ginning hostel check in guy. The jackets and backpacks are different. Although people can have multiple jackets and backpacks. We don’t see much of the shooters face but the eyebrows look different. Although, people can pluck/shave eyebrows. I guess the happy hostel guy would have come forward and been like “WTF?” and “I have an alibi” if it wasn’t him?
The two on the right are the same guy, just look at the waffle looking thing on the right, it’s the same jacket, mask, etc. the left and the right are definitely not the same jacket or backpack. The left jacket doesn’t look like it has breast pockets at all.