That wasn't the case. The lack of closing ability was not because of laziness but rather the inability to do one or more of the following:
1. Identify the problem.
2. Come up with a solution.
3. Efficiently implement the solution.
Usually the problem lies with both 2 and 3. Zuckerberg, Gates and Jobs excelled exceptionally well at all three of those items. Some of the high IQ clowns I worked with could usually do 1 but would talk and talk about 2 and in the event that they completed 2, they would waste time executing 3 with detours that had nothing to do with task at hand. In some cases they could not even get 3 off the ground. I have also seen this with "traders". They talk a good game and seem smart and in the event they execute 2, they can't execute 3 (actually trade).
All that being said, I have also worked with exceptionally smart people who were serious closers. These types really stand out and are the type of people I want to be around.