You couldn't be wronger.
Gretzky is head and shoulders above the closest competitors. Jordan, Ali, Ruth, Gibson all behind Gretzky. Armstrong falls in the 2nd tier, a. because cyclists carry a very narrow skillset vs. other sports and he didn't play any, b. he cheated, and c. he was dominant sure, but not as dominant as others placed ahead of him. Miguel Indurain is sitting on 5 TDF in a row from the 90's, without a positive test.
Jim Thorpe, Jim Brown, Bjorn Borg, Bo Jackson, Deion Sanders, John Elway, Jack Niklaus...Those are the kinda names Armstrong falls among.
Greatest endurance athlete? Maybe. Greatest athlete period? No way, Jose.