Yeah, there was a great video on YouTube I saw a few days ago that went over why Sony is backing Pocket Pair, why Nintendo is making this case about patents, why that's a massive risk for Nintendo, and why Nintendo is willing to take that risk.
It largely seemed to come down to the Nintndo-Sony rivalry that started when Nintendo backed out of the SNES era deal to create the PlayStation. Nintendo is trying to crush Sony's potentially viable competitor to their largest franchise and are making the case a patent case because that's the only route they can pursue. If they lose, Nintendo stands to lose those patents.
That song goes hard though. Felt bad ending it.