Alright, well originally I was called in to make a call about the Pollen vs Pollen attack. After much conversing I settled it down to a rough 80/20 favor towards Shadow in both their attempts to overpower the other. Originally it was to be they cancelled each other out, but through further investigation would I deem that wrong due to the precautionary methods taken by Shadow and vagueness set by Madara with his 'simply better than yours' attempt.
Of course, though I would allow Madara to continue defending himself 'verbally' in a way that may have changed my thought, but for the sake of time spent waiting on this decision an overall judgement call was request. So I will incorporate a mix of both into this one.
It was interesting to see that this was just the second round-about of turns within the match, as this pollen was only introduced to counteract the incoming snakes. Of course, Madara furthermore attempted to kill 2 birds with one stone as he continued the process to make pollen/fog consume Shadow's person. On the contrary, through Sharingan, would Shadow mimic the same technique and would both jet out at each other. The claim is, that whosever breaches first would become the 'victor' in some sense of overpowering the other. Now I must stress that prior to this technique even being put at play, Shadow has already been in a state of Perfect Sage mode where as Madara didn't exercise a similar power-up like so. 'Twas only after Shadow used the same technique would Madara choose to amp himself up with biju power in a sense to combat and furthermore overpower the attempt to copy his technique. This alone would leave me to believe that Shadow's had the ability and time to overcome Madara's before the biju chakra could help retain control. Regardless, once the breach was allowed, I believe the actual technique's effect would pull through, acting as the chakra absorbing assault against the very same chakra absorbing assault. This would leave Shadow's assault the dominant one in the field and something for Madara to have to deal with now going on with whatever else was involved. In theory this power struggle would halt/delay/alter any actions afterwards as well due to its severity.