That is almost a verification trait of Blueberry. I grew DJ’s original BB release in '94, a second generation release I have now, and several BB crosses over the years. Leaf variegation (white splotches) and deformation showed up in all of them. I’d be skeptical of crosses that never showed them. It’s a problem with Blueberry, a sign of inbreeding depression and homozygous genetic profile. Which is probably the reason BB shines more often in crosses than as a pure strain.
-b420