At first it looked like Shiva was the typical friendship-will-prevail-over-10.000 years of training dude that barely survived the villain's big bang shot and would resurrect to pull a bullshit Shounen comeback out of nowhere.
Then Raiden did the exact same thing. Both materialized their SSJ4 (not canon) final form and are gonna clash.
If the math lines up correctly it's gonna be an epic double KO, both dying with a satisfied grin on their faces, leaving both fan clubs fulfilled that their respective "danchou" was finally able to enjoy the true peak, which he was promised in his time, yet could not reach the apex due to a lack of suitable challengers.
Then again it's Shuumatsu no Valkyrie so you can never know
(except for Sasaki Kojiro, that one was way too expected to be the 1 win + infinite losses dude coming out on top over a random narcissist)