Brodie does not read it correctly. While the team may usually like to pressure the blueline, what he actually ended up doing was pressure the 3rd opposing forward in the neutral zone with two of our forwards already in the neutral zone. He didn't come anywhere close to making it because it was a bad pinch, and then he flailed his stick trying to hit the puck out of mid-air, as he left a 2 on 1 at the blueline behind him. I would have liked to see Marner read the developing play and get back faster, but he was not "sulking", and he was up there with Jarnkrok because they had a clear breakout opportunity that McCabe flubbed the pass on. It was a PK. You can't do man on man. You don't have enough men. It should have been a 2v2 with Marner taking the trailing forward, or Jarnkrok moving over and Marner going high. Instead, Brodie pushed badly into the trailing forward, McCabe moved over to the guy Brodie should have been on to defend the 2 on 1, and Marner was left to try and catch a quick forward with momentum at the last minute.
Nylander had pushed so far up that a 1 foot saucer pass would have been difficult and risky. If you can get it off, it slightly decreases the chance of it being intercepted, but increases the chance of it missing, hitting the stick in a way that isn't conducive to a quick shot, or bouncing over the stick for a break. When Marner looked to Matthews, both Tavares and a defender were in the way behind the net. Maybe he could have held on for a while, but people also complain when he does that, and this is such hindsight commentary. When you're in the final minute on a 6 on 5 and one of your best goal scorers skates in from the blueline cocked and ready for a quick shot, and there are people going to the net and no other immediate passing lanes, it's very reasonable to make that pass. It's also interesting that you're going so hard after Marner's pass being intercepted, when you absolved McCabe of any responsibility for a massively worse pass that created the whole 2nd goal situation in the first place.
Marner made a minor mistake on each of those goals, but was not close to the primary (let alone sole) cause of either of them, and it's ridiculous to blame the loss on him. Both of the things Marner did are done constantly every game to no effect or notice.