5 star skill rank up help

Nalak8

I don’t have any 5* skill champs above r3 but have a 3-4 rank up gem. Crossbone, kingpin, and killmonger are my best skill champs. I’m cavalier and my step is going to be completing act 6 beyond 6.1 and possibly variant 6. Which skill champ would be most helpful for ranking up?

Riptide

1 each lol

Unknown

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