Is This a Corollary of the Maria Grant Murders?

Three weeks before Amaria Grant had been murdered, there was another shooting that had occurred. In that case, they had recovered nine millimeter casings and projectiles from that crime scene. That was the same type of casings recovered in Maria Grants murders as well,. Now, could it be a coincidence? Sure, I mean, it is by far one of the most commonly used type of cartridges. But then when you start to put the pieces together and combine it with the facts that the gun was a cab driver, then it's definitely reasonable at least to think that this again is going to be another piece going in Rupert Hardy's direction as their suspect.