A stowage for a single port cannot be viewed in isolation. An individual SI is just a snapshot of a vessel at a particular point in time and does not give any context to the evolution of the stowage. Each stowage has an impact, either positive or negative, on future ports in the rotation and is, itself, a product of decisions take earlier in the port rotation. Increasing the CI in one port can result in a reduction of CI in a later port. It doesn't make sense to increase CI unless we can be confident that the cranes are actually available to us. It does not give any indication of the reasons and constraints in earlier ports that led to the way the vessel currently looks.