If CL had the rights I think she would have leaked them by now. I don't see how leaving would make the songs legally more available for release.If CL' songs are registered as hers, then she has all the rights over them but if she is sharing credits with others under YGE, is possible she could not release anything unless the profit is shared among the parties. On Minzy's case, it looks like YGE has all the rights, so it wouldn't be surprising if some of those songs ended up rearranged for any other artist.