Rumorville:  Theo is actually the Balkan, who plans to find out what he wants from Brenda via her best friend Robin.  At the same time, he plans on taking over Sonny Corinthos' territory...he gains access to Sonny's affairs, and attempts to obtain some revenge against others via "legal" means.  That doesn't mean illegal methods are not employed as well. The Balkan is after revenge and increasing his power base, among other things.  Anyone who gets in the way is just collateral damage.

As always...Believe it...or not!