Not really, in the novel it was stated that he developed the technique right after losing the Sharingan, following the war.I think kakashi learned purple lightning after the fact so we don't know it's full potential so maybe it could of destroyed the meteor
The events in The Last took place two years after the war so he already had it.
Purple lightning is a discount version of Chidori. If it was as powerful, he would have used it to destroy the meteor, but instead, he just stood there, helpless, while Sasuke did the job with his Chidori.
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