Okay my friend, first of all you get rude rather quickly. Now this might not be intended by you but you just treated me like a total idiot. You should be more careful if you argue with anyone if you really don't want to offend someone, just saying.
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Now stuff to back my theory up and to totally overrun yours (all are links so just clicky click if you don't believe me):
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Now I do not believe that you can do all that stuff in time if you aren't familiar with the earth element to a certain degree. Also you shouldn't forget that it is quite impossible to break out of the earth like that and still move on with so much force if you don't have enough space underground, to build up more impact, so this would mean that the whole he digged needs to be pretty extensive.
Untill now we both just made assumptions you shoudn't act like that if you don't back your thoughts up (which would be impossible because your theory was good but wrong).
That is actually a good point and the main reason I even cared to rewatch the chapter. I can't give you any solid conclusion here. It's either a missing gap in the story or simply a Jutsu that forces a way underground instead of softening the earth.