Between Oates, Byslma, Laviolette and Tortorella. Let's look at the respective coaches and the reason that they are on the hot seat:
Oates: Coming out the gate with 4 straight losses, while only being in the game for 1 of them. Not a good first step, especially with a powerful Caps team.
Tortorella: Losing 3 of the first 4 with the most powerful team in the league. This is their team from last year plus Nash, they shouldn't be losing.
Laviolette: Losing 3 of the first 4 while not scoring with one of the most potent offenses in the league. 5 goals in 4 games doesn't cut it.
Bylsma: Losing to 2 lesser teams in their first 4 games after blowing a lead. His complete refusal to alter his game plan and the general lack of maturity from the Pens really makes me miss Therrien.