Uh, excuse me? "Form of Landia"?
Just because it says he was possessed by the power of the crown doesn't mean he's the same being as Landia. It could also mean that Landia's parallel world counterpart was possessed. After all, it doesn't outright say that "Landia was blinded by the power of the crown". It refers to him just as "dragon", which could mean this is different Landia.
Either way, the description makes it too ambiguous to make it clear are Landia and Parallel Landia the same being or not. Even then, if they were the same being, he wouldn't be named Parallel Landia. So remove all this "alternate form" nonsense.