Thanks, Mr. Sinchan, for this thoughtful post.
What is interesting indeed, is the fact that we are taking this SG's method vs. Dan's contention rather too far.
Allow me please to think aloud:
In your post you yourself say, that because his superior memory SG can do without charts etc. What logically follows from this statement is, that the people with superior memory would not require charts etc to successfully trade, but less 'fortunates' definitely would.
Then where is the conflict. The matter is settled. End of discussion!
But that is not to be.
Reason is: we all habitually want to bridge any two contradictory statements. And we invariably fail, and the we invariably try again to do what we failed in. And the cycle goes on and on... Some call it discussion, some call it debate. Most of the times it is stupidity, pure and simple.
Fact. None of us likea to be considered a lesser human. Even all the the supporting evidence come in person and shakes our hand, still we'd refuse to acknowledge its existance. And go on adding 2+2, expecting 5 would come out eventually after N number of trials.
Fact. He may say anything, but SG doesn't know why he requires no charts. As Mozart didn't know why all the divine music came to him. As Einstein didn't know why he was the one to think up Relativity.
These sort people are called Mavericks.
And no IIT or MIT or Harvard is currently running 'How to be Maverick' Graduation Degree Course.
Accept the facts. Find what works for you. And get on with life. That is my experience, brother. And being a human I can be entirely wrong in my views.