Considering that said rules were expanded by 3 times their original length, I'd be forced to think that the section in parentheses must have received some attention. Based on that, I'm ruling that overrunning an ally is a completely valid option.
A friend and I spoke to Andy Collins about this at GenCon. He did agree after we showed him that the text under charge and the text under overrun is contradictory. He also said that the intention was to allow overruns of friendlies in a charge. Of course this was in the middle of a con with people making a ton of noise and hardly official errata.