AOE Spells - Can they be renamed? "Thunderga" rater then II and IV?

For example with Thunder II and now IV, they are AOE spells, Fire II is also an AOE spell, but Fire IV isn't...

Back when 2.0 launched Yoshi-P talked about why they were Fire II, III rather then the ga, ra etc... but perhaps we could see them return for 4.0???

Seems the even numerator on some abilities is off, from others, and having it with a different name like:
Thunderga
Thunderga II

Would work better, as well as going forward?

Thoughts?