I have an idea about Sr and PgV.
Although we have not seen it, the final battle should be between Shu and Valt (Sr vs. PgV).
We all see Sr's basic introduction on COROCORO issue, and it is claimed that Sr combined features of gV, nL, dF and sX, but didn't mention anything about other Spriggans (S2 or lS) except its name. Moreover, not only its shape is much more round and circular than other Spriggans, its Zt driver is also very different from previous drivers of Spriggans (Fusion, Unite or Merge). And in the story, Shu was defeated by Lui, and he dicided to abandon his friendship with Valt and other characters. In this case, maybe Sr can be regard as rejection of the past of Shu and Spriggan and combined advantages which actually does not belong to the him at the beginning.
On the other hand, we already know that tN will have Ultimate Reboot driver, and sR has the Star frame. And if we consider the Strike God Chip is a metal part and can gather attack power on one points, this is a little similar to Xcaliburs' features. And all the changes on PgV are based on the original God Valkyrie. So PgV might be the growth of gV with the help of others. In other word, Valt might fused other beyblades' feature to enhance his own advantages.
If the theory above is reasonable, Spriggan Requiem can be regard as "the Ultimate God which rejects all its past and steals the power which doesn't belong to it", and Perfect God Valkyrie can be regard as "the Perfect God which activates all its potential and unites the strength which maximizes its own features". The final battle is such a conflict between these two believes.
Although we have not seen it, the final battle should be between Shu and Valt (Sr vs. PgV).
We all see Sr's basic introduction on COROCORO issue, and it is claimed that Sr combined features of gV, nL, dF and sX, but didn't mention anything about other Spriggans (S2 or lS) except its name. Moreover, not only its shape is much more round and circular than other Spriggans, its Zt driver is also very different from previous drivers of Spriggans (Fusion, Unite or Merge). And in the story, Shu was defeated by Lui, and he dicided to abandon his friendship with Valt and other characters. In this case, maybe Sr can be regard as rejection of the past of Shu and Spriggan and combined advantages which actually does not belong to the him at the beginning.
On the other hand, we already know that tN will have Ultimate Reboot driver, and sR has the Star frame. And if we consider the Strike God Chip is a metal part and can gather attack power on one points, this is a little similar to Xcaliburs' features. And all the changes on PgV are based on the original God Valkyrie. So PgV might be the growth of gV with the help of others. In other word, Valt might fused other beyblades' feature to enhance his own advantages.
If the theory above is reasonable, Spriggan Requiem can be regard as "the Ultimate God which rejects all its past and steals the power which doesn't belong to it", and Perfect God Valkyrie can be regard as "the Perfect God which activates all its potential and unites the strength which maximizes its own features". The final battle is such a conflict between these two believes.