Figure 2 contains an example of such a case: the cascade model will have to predict the type of the entire phrase Donna Karan International, in the context 'Since <chunk> went public in ..', which will give it a better opportunity to classify it as an organization.
because the joint model and AIO have a word view of the sentence, will lack the benefit of examining the larger region, and will not have access at features that involve partial future classifications (such as the fact that another mention of a particular type follows).