There’s a slight debate surrounding Lauri Markkanen, and what his position is. It’s not a huge factor, as guys like him can play just about anywhere on the court when needed. He can be a power forward in a lineup that has three smaller guards, or he can be a small forward in a lineup that sees him sharing the court with the combination of John Collins, Kelly Olynyk, and/or Walker Kessler.
This has made Markkanen a bit o a unicorn of sorts, the true definitive positionless player that the NBA is currently enamored with. That said, positions still matter, as it implies a players assumed duties.