I was expecting like 400+ potency for the combo finshers and 500 potency for geirskogul. Isn't MNK getting like a 400 potency ability that consumes their stacks?

200 potency on Geirskogul...thats gonna be like 450-500ish damage at i130 with just HT buff, compared to Holy which does 900-1200, and WHMs can spam that crap.