If the leaderboard is going to continue to reset on a seasonal period, after about a month it's going to have a minority lead of substantial quantities at the top. It'll be those players who encompass the factors of a decent active sparrer and the leaderboard will serve its purpose in that way. However, I don't know if this will make sparring more appealing or vibrant for everyone else.

I really don't believe in the 'everyone's should be a winner' stuff, but the board is not going to seem accessible until it resets every 3 months. There's no opportunity to take the top people down without rising to them. The PK leaderboard also suffers from this but allows players to feel short term validation through its daily and weekly sections. Might be worth taking out the device-specific listings and doing that here.