Marsh white grapefruit - what's the verdict

We've already made two posts, questioning whether our Marsh White grapefruit cultivar is really a marsh white. After taking the fruit to several nurserymen, we think we've found out our answer: The grapefruit we remember as a kid must've been a Duncan, not a Marsh White, and apparently our cultivar is actually a Marsh White, and they pretty much all taste like the ones we have. Duncans are just a better-tasting grapefruit that have the full intensity grapefruit flavor.
We're certainly glad that we didn't try to replace our Marsh White with another of the same cultivar and instead got two Duncans.