Shenmue 0 could technically provide many answers if it was set in the late 60s with a young Iwao Hazuki and Zhao Sun Ming.For the record if a concept of Shenmue 0 exist I pray to God its after Shenmue 4&5. We gotta focus on finishing what we started first. Shenmue 0 would also spoil many of the answers we are looking forward to finding out in Shenmue 4&5.
The big story reveal could be that Iwao and Zhao had a broke back mountain style love affair in Meng Cun because they were always getting sweaty together and Lan Dis mother got mad and killed Zhao.