The Primordial Adept theme, which gives rod proficiency and has Implement-keyword powers, mentions no restrictions or caveats to its powers' implement use. Do only rods work for Primordial Adept implement powers, or is the gaining of rod proficiency just a 'gimme' for classes with no implement proficincies that take the theme?
In other words, can my Cleric/Primordial Adept use his holy symbol for Primordial Adept powers?