I'm glad you're responding with real (and good) data.In 28 NBA Finals (1980-2007), 26 champions were led by at least one (but often multiple) top-6 picks:
-Lakers won 8: Magic (1), Worthy (1), Kareem (1), Shaq (1)
-Celtics won 3: Bird (6), McHale (3)
-Pistons won 2: Isiah (2)
-Bulls won 6: MJ (3), Pippen (5)
-Rockets won 2: Hakeem (1)
-Spurs won 4: Duncan (1), Robinson (1)
Now, I’m not saying you HAVE to have a top-6 pick, I am demonstrating that there is massive precedent that blue-chip talent matters but also how cherry-picking works.
I do think more recent data matters more than older data. It's a different league in many ways than it was for the generation drafted in the 20th century. But we'll have to wait 20 more years to see if the tide turns once again more toward needing a top 5 player.