Abeloth also states that Vol has more experience than Luke (or at least much/equal experience), so I highly doubt Vol falls into the same bubble as Starkiller and Durron here.
__________________ ”You presume limits to my power. There are none.”
I don't think the term "combined with experience," was related to Luke. It seemed like a separate statement that added additional emphasis to Vol having a significant portion of Luke's power. What said mastery (assuming experience is being used as such) is referring to is ambiguous though. You're taking it as overall - I'm not seeing that.
__________________ "There is only Revan. Only he can shape this galaxy as it is meant to be shaped."
Even if the "combined with experience" part has no bearing on Luke, the point is that he's not a guy with much the power of Luke, but lacking in efficiency and mastery like Kyp or Starkiller.
Regarding Vol, there's also the matter of the actual feat he performed against Abeloth to consider, along with his supreme standing within the Lost Tribe.
__________________ ”You presume limits to my power. There are none.”