Because Byram, even with his high potential, hasn't shown much improvement since the cup run. I've watched Byram multiple times since that cup run and not once have I come away thinking "wow, he's reached another level". To this day, that's the best version of Byram I've seen. He has had troubles staying on the ice specifically due to concussion problems which are no joke (Look at Nolan Patrick). That's all without mentioning Mittelstadt broke out last season and has continued that good play into this season (leads the Sabres in points), and the underlying numbers all check out - he's the real deal.