Possible oversight or by design? First exotic I've seen
that doesn't have a rip/swing/wallop or such.

Thanks for looking.

There are several weapons that do not have an exotic associated skill with them. The village leader exotic was one, so are the dentures near Arial city.

I asked before and was told, it's ok, they don't have to have one.

But this one does, it just doesn't give an echo.

It enables the ability to RIP.

This may more be round the issue of no additional echo when wielded.
Maran Forgecraft vs Maran Leader

You stop using Ssara'fal, the six-winged warfan.
You wield the claws of a jaguar.
As you wield the claws of a jaguar, you notice you could rip open a long, jagged wound with it.
The claws of a jaguar feels like a part of you!

wield leader
You stop using the claws of a jaguar.
You wield Ssara'fal, the six-winged warfan.
Ssara'fal, the six-winged warfan feels like a part of you!

It allows you to rip, but it gives no echo and doesn't increase your rip %.

No pretty way around that.

*BUT* it does let you rip.