Hi, to answer your question - I believe, on logo tournament, it is a standard practice for every designer if their design chosen as the winner they should provide the contest holder with different version of the same logo (greyscale, one color, reverse, etc)
but If you think you need more detailed information / confirmation you could always ask the site administrator - we can safely say they are highest authority here - via the forum (
https://logotournament.com/forum/contest_holder_discussion ) or from contact us form (
https://logotournament.com/help/contactus )
Thanks
Riza