Why does the "Bernie at the March on Washington" picture look collaged?

This is the picture:



I've got this thing on my second screen right now, and it appears to me that six people were collaged into it:

Person 1: black guy off Coretta Scott King's left shoulder. The light on his shoulders is quite a bit different than Dr. King's, and they're dressed similarly.

Person 2: black guy two rows back from Mrs. King, slightly to her right. He just looks stuck in.

Person 3: little white guy who has this "halfway out of it" expression on his face; this is proclaimed to be Bernie Sanders. His head is quite a bit smaller than everyone else's, and the light on his shoulders is different.

Person 4: white guy who's in the same row as Person 2, and to the left of Person 3. Looks like a posed studio portrait. Head is larger than Person 6.

Person 5: white guy to the left of person 4, and in the same row as Person 3. Looks very badly cut out.

Person 6: white guy in a suit to the left of Person 5. Badly cut out around his head, more detail in his face than persons 3 through 5.

Some of the others in this picture don't sit well with me - the priest looks a little iffy, too.

I don't know why someone would do this, but it appears they did.