Those first two shots were taking very shortly after the blast. I find it suspicious that they just happen to show a woman who would be seriously injured in a wheelchair later. The only people who would have known this are the actors, who would not betray their employers by snapping pics of people before their makeup.
Therefore, I submit that the first two pics are FAKES!
1. You admit there were actors.
2. You think the pictures are fakes.
Now the Question is who has the motive to arrange the bombing? To send actors there, they must had known the bombing in advance. You won't say it was planned by Tsarnaev brothers, will you? Who has the motive to show people the fake pictures?
Obviously it can only be done by someone who can control media, police force and securities. Even those pictures were from them, we still could find inconsistencies from them if you study it carefully.