Maybe I need a closer reading, but I'm reading that the basic mythic subtype gives the DR that is explicitly called out in the Savage and Indestructible templates. Seems like the table could be dropped, and you as it is in the side bar for the mythic subtype, and maybe just have a special ability "mythic resistance" that both the savage and indestructible type grant (as they both grant the same amount.)
More over it seems that applying "mythic resistance" should grant an increase to an existing DR.
So a mythic tiefling with his FR/5, would nave resist all 5, and resist fire 10?
The mythic simple templates don't grant the mythic subtype.