Well, we see what we want to see
Seriously, here's their problem. The demographic is clearly men, thus they have to have men driving. They have two cars to show, the coupe and convertible. So now you have to have two guys, one in each car. The men can't have a rivalry in the piece because BMW doesn't want to play a favorite here between the vert and the coupe, so the guys have to be nice to each other. The design is inspired by water, so get some of that in there. And finally, the car is supposed to cause joy, so the two guys better look happy out there.