Well a bunch of things:
The victorious skin is already decided,I remember someone said it was confirmed to be an adc(I'm not talking about championship kalista).
https://www.reddit.com/r/leagueoflegends/comments/3ci34o/were_not_selling_the_victorious_skin/ (read the last line)
(It's probably sivir)
Victorious skins are for champions who were very strong(primarily in competitive) throughout the season,so there's just no way in hell zyra will be the one to get it.
There's also the issue that they hate the champion and would like to forget she even exists,but that's less relevant than the first two statements.