Dame is the greatest Blazer for me, but not the best. Best Blazer was Walton. Different things. Walton was an all NBA force on both sides of the floor and won the greatest battle as a Blazer, but he was not here long.
Frankly, if you had to build a team around a single player from scratch would you choose Dame at his best or Walton at his best? I would choose Walton. That's why he was the best. But, longevity and total games played is why Dame is the greatest, so far.