There ist always still room for improvement though. Especially in Ustinkovs case its a good opportunity to show off his offensive abilities, which is hard to do playing 10 minutes a night on the bottom pairing in the NLA. I think with a good tournament both players could potentially establish themselves as fairly safe second rounders.
I feel like Braillard would need an outstanding WJC (PPG+) to get himself in serious consideration to be drafted. And that alone would probably not be enough. He would need to continue to produce at the same rate or better in the CHL for the rest of the season as well. There is no shortage of undrafted players in the last few years that had really good tournaments and still got left on the shelf again that year. Biasca or Aebischer are recent Swiss examples. Florian Elias and Gabriel Szturc are some international ones. Now Braillard is a bit younger than most of those guys were, which should definitely make it easier for him. But I still don't think that a good tournament alone would already seal the deal.