Board Thread:Theories and Speculation/@comment-5407586-20150624095943/@comment-2120712-20150626190054

Perhaps Iwakagure kinjutsu that Deidara uses has a side effect of whatever element merger you are using. Maybe wither

A) Break Explosion release down to one of its based components(Earth) leaving it vulnerable to Lightning but still retaining its explosive properties other wise.

B) Explosion is in fact Fire + Lightning but while keeps the properties converts whatever chakra flowed through into Earth release.

C) Like option B but instead of convert to earth release just adds Earth release to the mix causing all kinds of trouble.

As for why Diedara would do something like this. Gari's unmodified version does not seem to be the type that is long range-able. Maybe unedited explosion release doesn't last long out in the air or other objects when it leaves the users body. The kingjutsu could allow Deidara to time the explosions to his whims in return for allowing Earth chakra to come in an muddle up the workings of said element.

The more I think about Metal release, maybe its a KKT. Maybe one brother inherited the ability to mix three elements while the other only gained the power to merge two. We saw with Onoki's family that the ability seems to had degraded.(He can mix fire, earth, and Wind but his granddaughter can only mix fire and Earth).