The goal of the PP is to score. If they get Selanne away from the better defenders, that's an effective way to create scoring. Most of the TOI disparity is coming from dominance by the PP1 with puck possession.
Also (another reason stats without context are worthless) - when a PP scores, the PP ends for TOI. If the PP2 is scoring faster but the PP1 is out their entire shift, you'd expect the PP1 to have a larger TOI.
BB obviously plays the percentages. PP1 keeps the puck and uses up time and wears out PK1 then PP2 scores at the end of the 2 minutes. Those 2 minutes are minutes in which the opponent scores very rarely. Percentages. Genius stuff.