Bottom bracket headscratcher

Spider only scuffs the chainstay by 2mm max. It's a pretty standard Shimano 107mm.
It is asymetric yes, but I though the idea of that was to give a lil extra clearance driveside - this one gives extra clearance non drive side.

Nope, it's designed for a double/triple chainring setup. It is designed like this to bring the chainrings closer to the frame, giving a better chainline and Q Factor.