Both born as an illegitimate child, both third in terms of royalty to the throne in their family. Both lives had traveled to other places near and far, made friends that would eventually assist them in battles to come to decide the fate of their homes. Nord and Liberl being the two most known examples, they both were care free and cared for their country.
Both returned to their country fearing it’s ruin by those in powerful positions to help make changes to improve it. I think Olivert came up with the idea to oppose Osbourne with Class VII when the bracers were removed from Erebonia as Class 7 is a lot similar to bracers work. You get requests/jobs and you complete them to an extent as Olivert says when you first see him in Trails of Cold Steel:
” Seeing them there, I feel they have the potential to be the light we seek. A light that can break through the storm cloud that continue to build over our nation day by day. “
Link to video discussing the light and darkness:
As in the light to help oppose Osbourne and Ouroboros darkness.
Link to video discussing class 7:
With these similarities I think Oliver could be considered the second coming or a modern Dreichels.
I hope you enjoyed reading this and thanks for reading.
Related Theory about Osborne: