Flavor hints at no SK.
Whether Mr. Hyde was actually the one to receive the present really wasn't relevent. It would still be sucessful in killing an innocent member of Halloween Town.
possibly says something else, but I'm really not sure what.
Also, the flavor says that anonymous put a package in the middle of town, and the small child delivered it. Some kind of middleman thing? Something fun to think about, but at this point, seemingly useless.
Mg? Odd. Mafia could've had their pick of anyone in the town. I'm positive that there was only one person worthy of being doc'd. Perhaps his silence hinted at power role? I'll have to reread as MG surely didn't stand out as anything special.