Please explain how being the best in the world at RTS games doesn't take cognitive ability.
All tasks require cogitative ability. I never implied that it takes "no cognitive ability" to play a video game. However, merely requiring a functioning brain does not make something a sport.
Example 1: This conversation requires cognitive function. It isn't a sport.
Example 2: Playing musical instruments requires cognitive function. It isn't a sport.
And tell me how the chess player can turn their skills into profit outside of chess differently from a RTS pro?
Higher IQ and the ability to anticipate and develop more complicated long-term strategies.
Chess is a far more demanding game than any RTS, which are all based on short-term and reaction-based tactics. A more appropriate comparison would be grand strategy games (which are typically played on tabletop), which could be considered sport in some circumstances.
Example of alternative careers for pro chess players: engineers, mathematicians, programmers, corporate strategists, etc. (the fact that a lot of chess players come from these fields and RTS players don't should be a big hint).
Examples of alternative careers for RTS "pros": None of the above because RTS problem-solving is too simplistic.
The point is that the actual cognitive skills involved do not translate reliably to the real world. The ability to respond in real-time to an opponent's moves based on timing isn't very useful in a world where serious opponents do everything behind closed doors and employ strategies that are executed over months or years.
Likewise, being able to twirl joysticks around in synchronization with your Overwatch team to a high degree of precision doesn't translate reliably to real life, where people have to be physically capable of moving from point A to point B over an extended period, have to have the stamina for extended exertion, and so forth. In fact, I'd wager $100 that the top Overwatch team would be torn to shreds by your average paintball team.
This whole exercise is rather pointless though. Not a single traditionalist is going to ever view esports as true sports until a holodeck hits the scene. None of the apologists are going to stop trying to convince us that it is. Futility.