Rasengan can counter any falling wepons above konohamaru.
Rasengan=The size of ones hand.
Konohamaru's Rasengan=Smaller than that.
You'd still have a head and shoulders for a target...
And you think that ANY ninja would just sit there and let Konohamaru raise his hands to the sky without attacking? Leaves him pretttty damn open.
But I do think Konohamaru would beat Ten-Ten, just don't agree with that point.
I am not sure that Konohamaru could beat Kiba. When Konohamaru fought Temari it was all in filler, but if that was his real strength, then Kiba wouldn't be a problem either.