I'm doubting about which B skill would suit he better, quick riposte or vantage? For SS I'm thinking of Distant def
are you keeping his weapon or change it to lightning breath ?
I suggest QR, because he is not that powerful with vantage.
the idea of vantage imo is to kill before you get killed.
that's why it fits unit like ares and brainhard, because they have so many power on 1 retaliation.
if you plan using lightning breath, then distant def is ok, otherwise, you probably better with close def instead.
QR3 is just for perfection, QR2 work just fine.
the problem with QR3 is that it is locked behind 5*, so not many people want to spent 20k feathers when QR2 can work just as good as QR3 on most cases.
If you keep his brazen, then vantage might be more useful than QR, because QR2 wont be active at the same time with your brazen.
I'd suggest stuff like Guard or vantage on B slot and darting stance on SS.
he has 39 spd with it, which can double some of the average speed unit.
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