The point of collaboration is to put people together that when combined are greater than the sum of their parts. You take person A individually and they may to X, you take person B individually and they may do Y. But individually X and Y might not be that valuable, it's their combination and the glue that combines them that is valuable.
What the article misses is that yes, 20% do 80% of the work. However, you can't predict which 20% will do 80% of the work. Not only that but it's not always the same 20% that do 80% of the work for all tasks and projects.
Collaboration is the 'glue', that little bit of added information, that combines the work of individuals into truly something great.
The challenge is how do you combine the work of individuals and I can tell you what doesn't work, rigidly planning and executing.