I completely agree, much like Chandelure it has to be accounted for because of it's HP Grass option, set up, etc. The reason both should be A is BECAUSE the metagame has adapated around them. In fact, Raikou may be very centralizing for all we know, but it isn't an S tier Pokemon atm because of the amount of counters and checks currently experiencing high usage for it.
What is luvdisc? Baby don't hurt me