Who's the lead and who's supporting?

According to Entertainment Weekly, the framing of who is a "lead" actor among the Modern Family cast is still up in the air, with the cast working along the lines of the following frames:

• age (adult actors v. children actors)
• résumé clout (favors Ed O'Neill)
• "traditional" family roles (favors Julie Bowen and Ty Burrell)

Which actors would you submit for the "lead" role of Modern Family, and on what basis?