10 bans is just another lie
If we have 5 bans per team, it is guaranteed that marksman and midlaner on both teams get a ban each.
Knowing this, we know that playing Zed will become virtually impossible next season(both team midlaners would need to intent Zed to let him through the ban phase), unless Zed himself will be virtually useless.
Since Riot just made championship Zed skin, we know they wouldn't allow any of above to happen.
Q.E.D.