I'd like to see it as a CD as it once was personally, or even better, a mechanic where you can switch between 2 targets and still continue building CP to the same pool. something along the lines of:
SS person 1, have 1 CP
SS person 2, have 2 CP and do 20% of SS's damage to person 1
SS person 1, have 3 CP and do 40% of SS's damage to person 2
SS person 2, have 4 CP and do 60% of SS's damage to person 1
SS person 1, have 5 CP and do 80% of SS's damage to person 2
evis either, use the the 5 CP and do 100% the damage to both.
Maybe have it include 3-5 targets and have every target tagged by it take the 20/40/60/80/100% damage (so hitting 2 for 20 then 3 for 40 and so on till ultimately doing finisher damage to all 5)
its only the SS and evis damage (not auto attack) so not OP.