If your cola has been snapped, I would suggest tieing it some place so that it sits up right, and yes your stock would get bigger if you tied your plant down in early veg because the stock is getting more light and less blockage from the branchs. I dont think that snapping your MJ cola's to 'enhance' bud in anyway is good, I think that who ever told ya that is full of shit. But hey, I could be wrong.