Fucale made it because he has thrived in big games in the past. His Memorial Cup numbers are crazy good. Paterson made the team because he was on the roster last year. I'm more confused on why they only brought 2 goalies, but the 2 they brought made sense.
Also, on Pouliot, he's definitely going to be on the team. His play in the 2nd game of the Super Series was fantastic. Sutter trusted him with a lot of PK duties as well. If for no other reason, he'll be on the team as the PPQB.
If I hade to guess, I'd say the D would be Dumba, Reinhart, Pouliot, Morrissey, Severson and Ekblad as the 6 D.
Edit: Reinhart is suspended for the first 3 games, so replace him with Pelech for the start.