It’s a crime scene. If they’d have moved the body quickly Crump would be claiming there’s a cover-up.
The biggest reason the body stayed in the street (and it was covered) was because the Ferguson cops had to wait until the St. Louis County Police could get the proper ‘brass’ on the ball, and travel to the scene to takeover the ‘investigation’ of the incident. This was done because of a prior agreement (incidents involving shooting of a citizen) and because the governor got drug into it by the media.
Remember, there was a professional agitator there, who is the one who came up with the HANDS UP meme (almost instantly) and who talked with Dorian Johnson before he talked to the police and media.
All of this went VERTICAL quickly. Once the STLCounty Police arrived, then it took a while for them to sort things out (even arguing a bit over jurisdiction).
THAT is WHY it took so long.