Er... you can't get Dragon Apotheosis, by default.  Capstone/Ultimate can only get up to fifth-level abilities, or advance those abilities.  So, you could advance the ability boosts, but you could never pick up Dragon Apotheosis.<br/><br/>And you don't have to take the Dragonfire Adept's breath.  You could pick up an invocation or skills or the Dragonblood subtype instead, and go from there, or just pour the feats straight into ramping up strength directly.