It should be loot in each stage in each challenge event. 15 stages in each category rare epic legendary its overall 45 stages. Best scores in each stage should earn similar loot. Its like overall best scores loot but this time you also put loot and best scores separately in each single stage. Of course last stages should have better loot.
But what about game economy?
What’s the value to SG here?
I’d settle for just a top 100 leaderboard on each stage with no loot.
This is a proper question for towers. So much effort in towers for nothing.