While that would fix things for a game with only one escort, like this one, it doesn't fix it for games with multiple escorts. Mafia can still be shut out from kills.
The main problem lies with the escort being role block immune(consort blocking escort would be mad helpful) and mafia not having a faction kill. Leaving one or two roles to do all the killing is just retarded. Takes away from confusing town and making them unsure of their actions.