Yes, he used the MS technique twice in a short space of time, and in the original naruto he could only use chidori 3 times max, so his chakra supply has certainly increased vastly.
Which makes me think...in yondaime gaiden kakashi could use chidori, in fact, he used it twice in the space of theoretically-hours, yet years and years later he still only increased its shot by 1??
sounds...strange to me lol....
I think the reason he could MS deidaras massive bomb was because it was a large mostly stationary target, deidara was flying and weaving around on a bird going quite fast while he was beam hopping, whereas the bomb just originated from one point which doesnt move-making it easier for him to do.
Though he ends up in hospital for ages doing it hahaha.
Lol, I think you mean Kakashi Gaiden.
But yea, I think the reason that is because remember his jutsu that he used during the whole ''Chunnin Exam saga'' wasn't a Chidori, it was a Raikiri.
I don't know the exact difference between them, but I'm positive Raikiri is more powerful.
I guess the upgrade to Raikiri took more chakra to use?
[Taken from NarutoWikia]
* Name: Lighting Blade (雷切, Raikiri)
* Rank: S-rank, Offensive, Short range (0-5)
* Users: Kakashi Hatake
* Hand seals: Ox, Rabbit, Monkey
The Lightning Blade is an enhanced form of the Chidori with the same effects and drawbacks, but more power. Kakashi learned how to perform this ninjutsu before Kakashi Gaiden but was not able to sustain it long enough to connect. He finally made it work after a lightning bolt struck him and gave him enough power to use it and take revenge for Obito Uchiha's death. It is also said that Kakashi cut a lightning bolt in half with this technique. The first time he used it and the legend of him splitting said lightning bolt are speculated to be the origin of its name. Because the Chidori is already powerful on its own, the Raikiri requires much more chakra and better chakra control, which is examplfied in its appearance. The Chidori appears as simply a mass of white electrical chakra in the user's hand, the Raikiri is more focused and blue. Like the Chidori, Kakashi can use the technique four times a day, which is an incredible feat, considering the intensity and chakra requirements. As seen when Orochimaru was talking to Kakashi after he used the Evil Sealing Method on Sasuke, he can apparently form the Raikiri at will without any hand seals. Somewhere in the time-skip, Kakashi developed the ability to cast the technique on both of his hands, which has only been seen while fighting the Akatsuki member Kakuzu.
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I think this might be a bit out of date because I'm pretty sure he can use it more than four times a day now, as he can use his MS atleast twice a day.