This is like, one man creating a game. And another man changing the color of the cover and being rewarded for someone else imagination. The design is what counts, if the color need to be change, should of ask the original creator to change it. A Good Community would not let one get cheated, and let another be the one to collect the rewards for another man creation. To be fair to one is to be fair to all, To be unfair to one is to be unfair to all. Someone should not have touch another man design or imagination, but should have asked for the changes to be made. I vote that the original creator get the reward, and if he decide to share it, it should be up to him. That is the right thing to do. Should not reward others for another man good works.
I agree on all but one point: No permission was ever given to use the original author's work, therefore I submit that unless some sort of agreement can be reached between the two of them I don't feel that the recolor should even be allowed entry as it is (even if it is modified) clearly a derivative.
This isn't for us to decide. Let them decide whether or not to allow it entry and how to divide reward, and if either logo wins the vote, we will abide by their decision on how to divide the bounty.
Words of reason. To the two logo designers: come to an amicable agreement and we will support the winning logo wholeheartedly