The way i saw it was that water and void had ambush, while the other elements had growth, surge, and mastery.
Then set 18 came out and everyone had these characteristics and it got messy.
I agree with allanime in that the T4 + ninjas should have ambush. They're bad guys, they ambush people, thats what they do.
Growth shouldnt have been phased out, there should have been an effect like the new flashpoints "put in play except by deployment" effect similar to the new Naruto that searches for Rasengan.
Bad guys should have Ambush
Good guys should have Surge, or Growth.
The OP characters like Raikage, Orochimaru, and Itachi should have Mastery or Senjutsu.