Yes I believe that the lightning that fell on Buggy and Luffy was done by Dragon’s CoC.It would be a very impossible coincidence that lightning fell on the right place and on the right time to save Luffy.
Also remember that there was a strange wind that blew by in a direction which would help luffy sail easily.
Yes I do believe that it was caused by Dragon’s CoC and it is similar to what happen in Edd War.