He had more points then Burrows who had time with the Sedins and if Burrows wasn't with the Sedins he was playing right wing on the second line, I'm not convinced Kassian could have played consistently well with the Sedins.
Baertschi only joined the team at the trade deadline and he hadn't done anything to that point which showed he deserved a regular spot in the NHL let alone being gifted a spot on the second line. But he has shown he that he is a much better player in our system than in Calgary's so he does have a good chance at earning that spot next year.
And as for Matthias his career high points is the same as Higgins career high goals. For that month that Matthias was ripping it up Higgins was in the top 30 in left wingers for points. Last season Matthias showed that he is a streaky scorer who is good defensively but doesn't use his size. I don't see anything about him that makes him any better then Higgins.