2CV now ensures, unlike any other proposed system, that the winner will, under all circumstances, be one who received at least 51% of 1st or 2nd choice votes.
A voters 2nd choice may be as good as their favorite or almost as bad as their last choice. There's no way to know, so ensuring a majority of 1st and 2nd choice votes is meaningless. Also, in any election where you can support multiple candidates there could be multiple majority supported options. The key is to find the one with the most support by looking at strength of support and/or number of voters who prefer them, ideally both.
I think we've already gone in circles about your other responses in previous conversations so I won't repeat that again here.