If you want to keep telling yourself that, it's fine.
Not really. The idea that teams will struggle to win if their top guys struggle to score isn't new, and it isn't informative. The Warriors barely beat the Wolves with Curry and Thompson combining for 36 points. The Spurs barely lost with Kawhi and LMA combining for 33. The Warriors' had Green and Barbosa to round out their top four scorers, and they combined for 33 points. Duncan and Parker were the next two for the Spurs, and they combined for 35 points. Warriors top four got 69 points to 68 from the Spurs' top four. And the Warriors used 115 possessions to get that while the Spurs used 108. So the Spurs' guys were able to score at a slightly better rate than the Warriors' guys. Difference was that the Spurs had a defensive collapse while the Warriors were able to hold off a much worse team.
This game didn't demonstrate anything, and it's frankly shocking that you consider such a well-balanced scoring game as an example as to why the Spurs can't win with just two scorers.
It's the same problem as your Green take. Yes, it would be nice if the Spurs had more consistent scorers, and it would be nice if Green could dribble and dunk over people and all that crap. But you're trying to concatenate the very safe (to the point of triviality) truths of those statements with assertions that the absence of those things either explain or predict outcomes. They don't, and you don't put in the work to demonstrate why we should believe they do. Green is struggling because he can't hit his open shots, not because he can't dribble. The Spurs aren't going to struggle without their top guys any more than Golden State will and has without theirs. This is just a reality of teams. Cleveland won't win if James and Irving don't score. OKC is nothing without Durant and Westbrook. Toronto needs Lowery and Derozan. If two of Paul, Griffin and Re struggle, the Clips won't win either.
You're not wrong because you think the Spurs need their top guys to score. You're wrong because you believe that's a unique disadvantage.