Outstanding guys should be eliminated from such challenge, like DdmrDdmr, who can rank up more to Hero, and Legendary. Even in the case the challenge open sooner, and DdmrDdmr does not earn enough merits for Legendary rank, he should be eliminated from such challenge. Because, if he has chance to join, he will win for sure with his fast merit-earning rate
Maybe, the top 50 merit receivers should be excluded to join the challenge.
Top 200 Merit Receivers without Merit from the Top 200 Merit Receivers