Board Thread:Theories and Speculation/@comment-3001903-20150829033326/@comment-25622409-20150829085948

Its more likely that Deidara just didn't have the necessary elemental affinities required for the Kekkei Tota. You also have to consider that for something as mind bogglingly powerful as Dust Release, the affinity must also be at a godly level.

For eg. Sasuke's affinity towards fire was such that he was even able to modify Katon into Blaze Release, something that he could teach to even, say, Konohamaru, provided he has as strong an affinity to fire as Sasuke. Although there is the matter of whether it is only something that can be done with the flames of amaterasu.... But that's a different matter!

Point is, Deidara already possesed a Kekkei Genkai, and one that is a clan related one(since Iwagakure has an entire platoon of Shinobi called the Explosion Squad).

That means he already has strong affinities towards the two natures that make Bakuton. And considering just how hard it is to master One Affinity, its likely Oonoki didn't see the need for it.

Also to be considered is the fact that Deidara left Iwagakure at the age of 14-15, which isn't really that old. Oonoki quite possibly didn't expect the betrayal and probably had made plans for Deidara to learn Dust Release later in his life.

Not to mention Deidara was strong enough to get into the Akatsuki at such a young, and also that he could escape from Iwa affter a massive bombing.

Its a good thing he didn't learn Dust Release... Just how strong would he have been with it?? As it is, he possesed the capability to wipe out one of the major villages completely off the map(albeit in a suicide attack).