Wouter, in case you didn't notice, I said "it looks like he screws up." That is, I don't understand how he can say that a sloop rigged boat can have enhanced pointing ability and have an increased downwash angle. I have no problem accepting that a jib can "enhance upwind performance," and if that's what Gentry had said, I wouldn't have questioned a thing. However, "enhancing upwind performance" is more vague than "pointing ability." Perhaps it's just a matter of definition, but I fail to see how, as you say, "a sloop rig at its optimal pointing angle does sail lower than a uni-rig at its optimal upwind sailing angle" and yet have increased pointing ability.