As expected, more info is coming out that contradicts Allenby's story- he was discovered by a homeless woman 1 block from the bar, not 10km.
http://www.golfchannel.com/news/golf...bar-not-10-km/
My guess is he owed these guys money for some reason- gambling debt or something, and didn't want to pay. Or possibly even more simple- he passes out drunk and hits face on pavement, some passerby's steal his wallet.