In the first picture, hasn’t anyone noticed the guy in the white shirt almost even with the left brick pillar on the sidewalk walking left holding something that he wants to keep upright, like a pressure cooker with a towel over it?
The other person was pointed out earlier in the thread. He has a one shoulder strap bag or bag pack and is standing between two brick columns. If you look to his left, there appears to be a police officer or press person. Located just to the right of the black man with sunglasses. The Korean with should strap might be trying to hide from that police officers field of view.
I see what you are seeing. Also will mention picture 131 and post #190.
Clearly there was an open walking path between the single row people standing behind the barriers and the people sitting in front of the restaurant. It could be they were smart enough take the backpack with them?
Or maybe he had 2 backpacks and dropped the 2nd exploding bomb off first before he dropped off the other bomb that exploded first. If the guy with the black backpack in pix is the perp then he already dropped the bomb at this location and was headed towards first explosion area maybe to drop off the other bomb (the one that exploded first)?
My understanding is they are not sure how long before the bomb exploded this “before” pix was taken.