This is something that's been confusing me. Takeru has the Raigeki Disc, and that should be lightning-based mojikara...yet he has fire based mojikara.
I've always wondered how it worked...but maybe because Lightning can be similiar to Fire, all he had to do was train to use the lightning mojikara differently, and bam, you got fire.
(I'm basing what I said off the tropes for Lightning and Fire based character's attitudes. Then again, Takeru already breaks the Fire based trope...)
If this has already been talked about, sorry. ^^;