Here's an Alternate version of the 3rd opening even thought the song didn't won, but just for my amuse and for those who for it

Destiny of the Armored War God

(Opening theme; Innocence by Aoi Eir)

Kakushiteta kanjou ga himei o ageteru tashika na chikai o te ni

The opening starts with the sun shines brightly as cherry blossoms appeared flying through the air. Then one petal fall on the ground besides Nagata's foot before he turns around, behind him the museum and the modern era all changed into the Touka village in ancient China with the Shoku faction besides him.

Destiny of the Armored War Gods

Kiseki dake o motome kienai yami o samayou

We saw Nagata sitting on his chair in front of his desk with paperwork as he looks through out the window in wonder. Then switch to an open field with him on his Sakura Hurricane.

Koko ni ireba nidoto mirai mirugoto dekinai

Then we switch to Kanu and Chouhi training with Bacho and Batai observe them along Ryuubi while Chou'un was on the rooftop drinking sake, then we switch to Iori helping his wife, Kochu and his daughter Riri while Komei also helps them.

Koyoi mo tsuki ga sasotte mada kotoba dasenai kedo

We then switch to Mitsuki evaluate the Crimson Guard, then to Masakata counting the distribution Lockseeds

Kokoro no naka sakebi tsuzuketa

Then we saw Nagata, Iori, Mitsuki, Marcus and Masakata standing to a battlefield with the RinJyuKen Akugata with five giant figures approaching before they unlock their Lockseeds and activate their transformation before they run at them.

Kakushiteta kanjou ga himei o ageteru tashika na chikai o te ni

We then saw the Shoku faction fighting an army of Rinshi before Gaim and Ryugen use their hissatsu wazas performing a horizontal slash and purple energy blast causing an explosion.

tashika na chikai o te ni

We then saw the Go faction, then to Gi faction, then to En faction, to To faction and lastly Kosonsan alone.

Ato honno sukoshi dake tsuyoku nareta nara

Nagata was on the ground before he stands up looking at the sky.

Me no mae ni aru kono sora koete yuku kara

Then the boys were outside in front of the museum with looks that said they've made their decision

Kono saki ni aru mirai ni te o nobasu kara

Then we saw the Armored War Gods entered the ring of the tournament before a quick shift back to the Shoku faction with Nagata and Iori and the others facing.