Card Jitsu Water Theory

Hey I have a Theory. If you see in The middle of the ninja hideout you will see The 3 signs of Card jitsu i.e. SNOW WATER FIRE.

Also in The Dojo Courtyard you can see the Volcano (home To Card jitsu fire) A Waterfall (Possible FUTRE HOME OF CARD JITSU WATER!) AND A MOUNTAIN (POSSIBLE FUTURE HOME OF CARD JITSU SNOW!)

 And if you see in the Ninja hideout the water sign is 2nd and snow is 3rd

In the dojo courtyard the Waterfall is second and Mountain third so could Card - Jitsu Water be coming next? Maybe!