hell to the naw, sosa hit tony that same night he killed manny. so lets say manny was still alive he'd still be at his house breeding with his new wife while montana's house was getting over ran by sosa's goons BUT it'd make an interesting plot to happen if manny would of survived.
If Tony still had Manny that means Tony would have been sober enough to coordinate a defense and possibly survive. If he had Manny by his side then between Tony, Manny, Ernie,Nick the Pig and Chi Chi they could have barricaded themselves in Tony's safe room, all loaded up with the assault rifles with grenade launchers and blow Sosas hit men straight to hell.
I like Tony's chances of winning if he had those 4 loyal soldiers by his side armed with the assault rifle/grenade launcher. 5 men willing to die for each other armed to the teeth is very tough to beat