Board Thread:Questions and Answers/@comment-14751329-20131106190919/@comment-5951231-20131112224740

I look at it this way, if Gavan is a part of the Super Sentai Universe, then the Earth Branch of SPD did not come into being until the mid 1980s and even then they were just starting out so they handled things on a case-by-case basis and didn't have enough personnel at the time to handle alien invasions.

So they let the Sentai teams of that era combat those threats and then assessed if they were needed to handle the situation in later periods while keeping the public in the dark about Alienizers on Earth to prevent panic. So kinda like MIB in their early years.

Once aliens went public, the focus shifted to keeping them and humanity safe while arresting those who would hurt the innocent.

As for Ohranger, can't we just assume that Toei retconned that hiccup and that the Ohrangers were active during the years 1995-1996? It would make sense that after Gokaiger, all the teams would have their continuity rearranged neatly into one shared universe. The 1999 thing was a minor hiccup and nothing more.