What I am more talking about is that the Great Wyrm started life with the template, so does that replace it's steadily progressing flight? What happens if you grafted Feathered Wings onto a great wyrm? (Average maneuverability, twice land speed). Or takes the Improved Dragon Wings feat.
Q78
Do energy resistances stack from different sources? EG a tiefling has resistance 5 fire/lightning/cold. Then add a template that has cold resistance 10, does it become cold resistance 10, or cold resistance 15?