MZ3K
Grandmaster
Maybe we should just limit half the PS and all relic drops to the top N% of players based on time spent in champ...
It shouldn't be time based (for the reason that @girana mentioned), but I think you're on the right track.
The easiest thing to do would be to add in a minimum score required to be eligible for a drop.
They might also make dmg dealt early in a champ give more points per dmg so that the later the raiders arrive, the harder it is for them to reach the eligibility threshold