It is hard to respond directly to the poll. It includes top of the game players at some positions (Beal, Lillard) but not at others (best bigs are players like Markkanen, Porzingis, Wood) who are certainly not top of the game at their positions.
Clearly Beal or Lillard are better talents than Markkanen or Porzingis but we would be much better served by adding a skilled big to the team over adding another wing/guard. If you ask me if I rather have Beal or Markkanen, it is hard to pick the big. That is why I don't feel the poll is fair.
If we got Beal or Lillard, it would probably cost Brown. To get Markkanen or Porzingis, it probably costs us Smart and Thompson at most. If we were able to bet Beal or Lillard and keep Brown, I would be immediately trying to trade Brown for Sabonis or Towns as Brown would no longer be the ideal star to play next to Tatum and Beal/Lillard.