All youve said was a filler.I see why you didn't want to get in it Konohamaru was hanging with Jonin Temari and as far as his jutsu you must not have done your hw on them. He not only has a complete Rasengan now but he's also learned fire element jutsu and mastered Kage bunshin so as far as wiping the floor with Konohamaru I think not. Sasuke would most likely win but not without difficulty.
Link me a chapter in the manga where he has used 1, just 1 katon jutsu