Well, I think it surely ended the debate on whether BBD is an NBA starter-level talent on a good-to-great team. [The answer is no]
But there is a corollary to this....
When Red Auerbach "invented" the "6th starter" role, it meant taking a starter-level talent player and bring them off the bench to ensure 48 minutes of attack basketball. Then some other, less-talented player starts, but they're deficiencies are covered by the abilities of the other 4 actual starters. That was one of the genius things Red came up with. Nowadays, Jason Terry (and Ginobli in recent seasons) would be great examples of starter-caliber players coming off the bench.
So...If BBD is not a starter, then he's not a "6th starter", either. A good rotation player, yes. "6th starter", no. He is definitely and clearly a bench player.
So, to the OP, yes, KG's absence hurt BBD, who might have been able to convince some GM this summer that he's worth more than he is. I'd say this past couple of weeks may have cost him millions of dollars (that he probably wouldn't have deserved either way).
Edited to remove gender bias.