Weighted score counts for nothing at all. Weighted score for MVP and Slayers is calculated by:
#of mvp or #or kills multiplied by a fixed number
(different for all brackets). The higher the bracket lvl, the higher the number
you multiply with is.
For example for 70 arena for slayers:
Player A has 694 kills and a weighted score of 1388. So the number
you multiply with is 2.
For 30, 40, 50 arena the number
is 1. For 60 it's 1.5, for 80 its 2.5 and for 90 it's 3. ( i think that's how it is, i can't really check for all).
For MVP, then number
is higher than for Slayers. If you're curious just look at the ranking and divide for yourself