Relic Delta - questions and feedback

I'll have to look back at some of the videos posted by creators for the answer to #1 (Egnards had a video last night that includes this info), but from memory it was something like 45 or 50% for 2 levels difference.

For #5, my understanding is that all the damage computations are computed for each character, not for the entire team, so if you had a mass assist against an R9 character with R5, R6, R7, R8, and R9 toons attacking, each of these would have a different relic delta that would lead to a different damage impact.