Pretty blunt for a hit to break into somebody's house, risking the neighbours to alert the cops and be arrested. Or give Del Balso the time to arm himself or call the cops or his buddies. This was a risky undertaking for a hit squad if that was the case. As we've seen before, hits are carried out swiftly so the hitter can get away without being caught or recognised..
It was pretty blunt to hit Sollecito within seeing distance of the police station too but yet they pulled it off. I wouldn't put anything past them anymore.
Like I said, the hitter had the opportunity to strike and get away quickly without being caught. Breaking into somebody's house can be time consuming for a hit.
Anyway, from what I understand from the latest article these guys didn't break into the house, but nevertheless they were arrested so this will be interesting because the police will now be able to find out who was behind this.
If Del Balso answers that door chances are they are off in the woods before anyone gets a chance to get outside if they blew his head off. Plus if it's just one shot nobody would probably even look outside. Like many hits that need more than one thing to happen for it to be quick, this one just didn't present itself. It basically comes to what they consider a "break in". Maybe they wanted to kidnap him? Many many options here.