At last! That is THE question indeed!
Kipsang is, right after Kipchoge, the best and most consistent marathon runner ever, so when he claimed to be in "far better shape" than last year (=in the shape of his life) and that he'll break the WR, this had to be taken VERY seriously.
He looked very good and comfortable in the race up to 30k where he suddenly dropped. God what happened to him?...
The brojo's: what are you f...ing doing??? No info about Kipsang DNF on letsrun web site!!!
I wondered this as well. Conspiratorially, I wonder if he took the money to race Berlin to increase the hype; but also made a deal ( Known/unknown by Berlin organizers?) to drop at 30k.