Having Guhle and Hutson on the left side is the main reason not to draft Buium, and its highly unlikely that they will be gone within 5 years.
They are trying to build a contending team. If you don't look at team needs, then you're not building the team right. It's not much different than looking at players with size when a team already has a lot of smaller players.
If Buium is Makar, he will be gone before 5th. In reality, Buium is much more likely to be a 50-60 pts dman than a Makar, and we could very well already have that in Hutson.