Why did Riot never add Udyr's updated ability from 2013 icons to the game?

In 2013 Riot went and commissioned artist, Radioblur, to create a ton of new icons for the game. Almost all of them made into the game, however, Udyr's updated icons never did. They just didn't put them in the game. Here is a link to an artist's deviantart page where he posted a bunch of icons he worked on, including a bear stance icon on the left middle under tibbers and the other 3 scattered around the image. Heres an easy link for all 4,

So what's up with that? Why were they never added?