[thetrumanshow]

I kind of see the value of raw talent/intelligence as approaching a limit. Like this graph: http://www.mar.dfo-mpo.gc.ca/science/acon/GIFs/data_dialog3_...

The commenter's idea seems to sync with this notion, as the really talented people kind of group near the top of the curve. This would mean that they are all intelligent/talented enough to master eachother's job.

I bet there is a great deal of luck involved in the outlier cases... which you seem to be attributing to talent alone.