Is earth the only element that can imitate all the other elements?

So i know about Yun, the false avatar and i was wondering if the other elements could do something similar and how would that look like?

Like can fire benders bend lava (genuine question cause lava is more earth than fire..) and if they can bend lava would that be considered as “earth” bending or “water” bending or can they bend water vapor?

Water benders can bend mud, to some extent i guess but earth has better control over mud, and i guess they can bend mist which could be “air” bending

As of Air i have no idea how it can imitate the elements.

someone help me out here!