Why and how the text could be Bavarian

[JoJo_Jost]

I really cannot see much hope from the evidence you provided for the manuscript being Bavarian, or any other Germanic language or dialect.

Given Germany’s fragmentation into small kingdoms and duchies, and the many small rural dialects, German/Bairish is certainly a plausible possibility. Especially since the marginalia are in Bairish, it is at least a plausible theory.

But it is not an artificial construct either; a system capable of reconstructing these extreme and diverse structures would be a terrible anachronism.