[vin13ish]

Did Toei purposely add the Friendship theme in Fourze due of the earthquake?

I think Fourze was originally to be different than the one we got but because of that earthquake, It seem Toei did that so it can bring hope to those who lost their family member.

I think OOO KING was supposed to be The Main Villain of Summer Movie but they scrapped him in the wake of earthquake and replaced him with another ancient villain whose role was to possessed a woman so her kid can get involved!

And The Villain Rider from Fourze and OOO Movie War was a brainwashed rider because earthquake and having an evil rider in Fourze would ruin the concept of friendship!

To support this evidence, The original intent of Gokaiger was to have only teams who were going to give a notable power that would help the Gokaiger appear in cameo, most notably the previous four teams (Gekiranger, Go-Onger, Shinkenger, Gosieger) and several other notable teams (Magiranger, Dekaranger, Abaranger and Hurricanger), as well as a film with several others appearing in cameo. However, the tragedy of the 2011 Tohoku Earthquake on March 11, 2011 lead to a major outcry to create a series which helped people cope with the tragedies and inspire hope to all people. After one weird fluke, Sentai alumni appeared in many of the episodes in response, unexpectedly leading to changes of story preventing more character development but ultimately letting one actor from all 34 previous series appear throughout the entire series' run.

Yup, They may sacrifice the character development for Goakiger but it was best decision for Toei