That first pic looks like an unflattering angle more so than anything else.
Regardless, the extra weight shouldn't hurt him as long as a. He didn't put on too much weight and b. he has been skating while packing on muscle. New muscle needs to be trained to do what you want it to do, so as long as he's been on the ice with regularity, it shouldn't hinder him/he shouldn't be at risk for further injury. The point of diminishing returns speed wise is something a bunch of people pay attention to at this level, I can't imagine any trainer worth a damn would ever allow him to get there.
Anyway, I wouldn't worry too much about his speed as that itself isn't an issue. His game has never been about burning guys wide. Having that extra strength to be able to separate other people from pucks/lean on defenders/bull your way to high traffic areas is way more important for him than to have super jets. If that ends up becoming part of his game? Fantastic. Even if it doesn't, Id rather he train to further enhance what he already does well.