I think it would have helped a little. i dont think manny would have been able to get him out of the mansion b4 sosa's hit squad came because tony is too arogant and is already pissed at sosa because of the phone call he recieved earlier.
but tony would have been more prepared for the attack. sosa would still have gotten through due to the fact that tony had hardly any gaurds. but maybe him and manny would have been at the top of the balcony and the might have been able to kill all of the hit squad but i doubt it.