Samurai question

[Dzian]

Guren isnt underwhelming. Its real strength is against multiple targets..
2 targets is 1400 potency. (28 potency per kenki)
3 targets is 1800 potency (36 potency per kenki)
4 targets is 2200 potency (44 potency per kenki)

Compared to say kyuten.
Against 3 targets that works out at 18 potency per kenki
Against 4 targets that works out at 25 potency per kenki.

It doesn't even come close to Guren in terms of power.

That's why many Sam's will hold guren unless they know there won't be a better time to use it in the next 2 minutes.