Lets assume Saakashvili had put more money into Georgia's military, specifically buying more fighter jets, attack helicopters and providing more advanced training for the Georgian Army, plus more S.A.M sytems.
Also, if Georgian special forces were able to destroy the Roki tunnel, the main connection allowing Russian forces to cross into South Ossetia, and, combined with the more better equipped and trained forces than in otl, would Georgia be able to hold out for longer than five days ?