I think they would go together, but the Cascade may overpower the Wai iti, which is a great hop. The wai iti will add an extra citrus dimension and fruitiness the cascade lacks.
Use the Wai-iti in a single hop beer, as its so low in AA you can use loads late on without going really bitter. Really good for a dry hopped lager, as its bred from Hallertau mittelfruh but adds fresh Lime notes. I recently won a comp using it in a SMaSH saison, has a lovely new world character when fresh, but ages out into a classic noble hop when the lime drops off after 6 months.
I also use Wai iti in a chocolate Lime american brown ale to good effect. The cascade could replace the citra in this...
http://macchomebrew.club/index.php/2017 ... brown-ale/
As for the Cascade? Heavy handed hopping in an American Pale Ale is a winner.
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