I asked Juanchella Francis at Decatur PD about the possibility that the Glenlake mugging and Ridgeland robbery are related.  Here’s her response.

Although there are a few similarities, i.e., number of suspects, same general age range, race, and gender, there are several aspects of the crimes which differ significantly. One of the incidents occurred on the street and the selection of the victim appeared random, while the other victim appeared to be specifically targeted and the crime occurred inside his residence. The level of violence was significantly greater in the second incident. Also the description of the suspects in the second incident differed in hairstyles and height. We have not completely ruled out the possibility that both crimes were committed by the same individuals, but do not believe it is likely.