Jeff zone 8 N.C.

Well you do not mention any other offshoots so I think leaving the new shoot still attached to it's VDN mother, but cutting it's trunk off after it has attained enough size and destroying its growing point would encourage a possible new and better variegated shoot from it. Also it should encourage more shoots from the original mother corm that would hopefully push new better variegated plants. I am not sure if I can explain this clearly but from what I have learned from you here, then the best new variegated shoots would be formed from the corm directly below the variegated leaves. You would find this "better chance variegated area", of the corm, by following the leaf sheath of the variegated leaves, all the way down to the corm where there would be a larger concentration of variegated cells and so a better chance of a variegated shoot from that area. I guess if I was trying to get that poorly variegated shoot to throw a better variegated plant (and I was confident enough) then I could go as far as removing the side of it's corm with the all green leaves to shift the plants efforts to growing on the variegated side.