I agree with Wayne: he was there to set up the machine gun attack--directorial license.
I thought GFIII isn't a bad movie if considered as a standalone. But, of course, it can't be considered as a standalone. It is glaringly worse than the other two.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.