Ha-ha! All these speculations. So you think that it is outside any living human´s ability to go sub 12:30?
I think posters like you said the same before Auita broke 13 and again before Gebrselassie over some years first broke 12:50 and together with Komen 12:40 .
You don´t think anyone can run a 2 miles in 8:02, one more mile in 4:01 and then finishing in 27 seconds. What about the guy who ran 7:54 in the 2 miles. What did you by the way predict BEFORE his 2 miles race in Paris last year?
I suppose you agree that a runner needs to have a monster aerobic capacity to go sub 12:30? If you don´t think Jakob can do it now what about in a couple of years? Or do you think he has finished improving his endurance?