Offensive flow is like how good u set ur offense
its mainly attribute to the guard's PA, HA, DR skills (PG>SG>SF)
if u found your offensive flow lower than the opponent's perimeter defense, then the ball will be harder to get to where u want to receive the ball therefore harder to score, more TO, take more time to develop offensive.
Many people win the battle of scoring vs defense but fail to realize they have no bullet for their guns.