Speed is the current hyped trait in the league because of the way the game is played today, but as a stand alone asset it really doesn't mean much. A kid like Griffen Molino can fly, but doesn't have much else to his game.
Gadjovich is definitely a lumbering skater, but if the Oilers can figure out a way to get the current version of Milan Lucic into top-6 minutes in NHL games, the Canucks should be able to shelter a weak skater too. And IMO Gadjovich has enough skill, size and willingness to use that size to justify at least a cup of coffee in the NHL eventually.
He definitely needs to meaningfully improve his skating to get to the next level, but I don't think he needs a Bo Horvat-like miraculous breakthrough to get to the level of a fourth liner. Paired with someone who could play to his strengths while making up for his weaknesses (Sutter/Virtanen??), I think he still has the potential to be a reasonable bottom-6 guy.