I don’t understand how people can play with L2 as light button unless you’re REALLY comfortable charging with your middle finger. Otherwise you can’t call whatever assist you have on L1 while you’re charging.
I use L1 as my light button for that reason. I’d much rather be compressing my index finger for long periods of time and only occasionally using my middle finger than vice versa (middle finger hurts like hell if I hold it down too long). Vergil doesn’t need to charge for the whole match like Zero so it’s not as big of an issue for him I guess, but if you wanna be able to charge and call assists comfortably, I suggest putting your L button on L1 or R1, rather than L2 or R2.