Sure, Sullivan would be a great choice and if he were available, I bet Drury would pounce on him. But, Sullivan is not perfect either and plenty of Pens fans are critical of him. The perfect coach does not exist, all have warts.
I still find it unlikely that Drury will hire a first time coach. None of them have those darned warts yet.
I always say that the only person who can manage or coach a team that way I want is me. that is never going to happen. I don't expect coaches or managers to be perfect. That are so many ways to be a coach, all work, all fail.
Though personally, I have no issue with hiring a first time coach, I think, in the end, that we are going to end up with Laviolette. Maybe he will succeed, maybe not. But we can say the same about every potential hire.
To me, the main question is: at this time and in this place, with this team, who is the best potential coach? I'm not sure and I don't believe Drury is either.