Not easily. I’m not currently keeping all dare historical data – only the last 30 days.
Changed in v.67 
Idea
I assume so that it shows up in the League mission preview. Does it really affect your strategy knowing which one it is?
Pecking order doesn’t mean you necessarily have to kill all enemies – just that those you do kill, you kill in order. This is a technical limitation disguised as a “feature”.
Yes
25%
It’s not exploitable.