Aho is currently on the fringe of being considered an NHL-level defenseman. His performance last season was much more than most would have expected, yet, he's the defenseman to come out of the lineup if the team believes they can improve at the position.
While size isn't considered as important as a decade ago, it still has its benefits, especially on the defensive end. Measuring 5'10" and 180 lbs, Aho struggles against larger opponents, especially in front of goal. Coming up against a much stronger net-front presence, Aho has difficulty moving the opposition out of dangerous areas in front of the crease.
Aho's deficiencies became more prominent as the Isles took on the Carolina Hurricanes in the first round of the Stanley Cup Playoffs. The speed and physicality of the 'Canes became an issue for Aho, as it took him a few games to look comfortable with the pace.
With three options as the Isles' third left-handed defenseman, the leash will likely be short for Aho, as his position could be in jeopardy if he doesn't perform.