mayweather fighting in the pocket

It seemed like if mayweather wanted to he could have halted maidana's advances with some stiff jabs but instead let maidana get in close and smother him along the ropes. Granted maidana didn't land much when he got in close he DID end up wasting a lot of round time which was to his benefit. Was mayweather simply conserving energy, or did he think he was actually accumulating more points in close quarters. Mayweather did land a few solid shots in the pocket but not really enough to justify it.