In fairness, most goaltenders will struggle in back-to-back situations. General intuition supports that - certainly statistical studies support that. I'm sure we can also recall from the stretch run in 2013-'14 when Bishop got run into the ground on back-to-back starts because Coop wouldn't trust Lindback to catch a beach ball.
Poulin's essentially a paper backup. I can't really fault them for wanting to get Kristers regular reps, but you really hope that Bishop starting 8/8 to start this season doesn't put him behind something of an 8-ball going forward. Probably going to get a bit more Vasileviskiy, including some consecutive start patterns from him, when he's healthy again.