Zamioculcas Zamiifomlia variegata

The Story: So I bought this variegated plant as a starter, it was only a leaf than I put it in water it and grew a rhizome. So I put it into soil and forget about it. Sadly the leaf it had died. After a few months of only the rhizome sitting in soil it grew a new pair of leaves. I was soo happy. The small ones with variegation. A few weeks later it grew some more. Those two (the top ones) stayed green. Now it seems like there are some new leaves coming.

The Questions: Why are the top ones not variegated? Do you think the new ones will be variegated? If not should I take the two bottom ones and try to propagate them again to get only variegated leaves?