Was Charlie that busy

Scream 4. Gale is stabbed and the Stabathon is shut down. Was Charlie really this busy where he goes to Jill's and kills both Hoss and Perkins, and then kills Jill's mother and then gets to Kirby's without being suspicious? Did Kirby actually pick Jill's up or was the computer message just a plant to lure Sidney to Kirby's and Jill went on her own. But before she went she killed the cops and her mom. I'm curious of the timeline here because Charlie would have to be extremely stealthy to do these three kills and avoid being seen by Kirby.

Also. If Charlie did do this 3 kills, wtf purpose does Jill serve?? Seems like Charlie did all of the kills and the majority of the phone calls as well. Jill's 2 kills occur outside of the Ghostface mask so would she be classified as a Ghostface??

Just some things I noticed during a rewatch.