Faced with many unfair conditions beforehand, Guts had a very big disadvantage fighting against his rather violent, Bazuso-type opponent. Despite being against all odds, Gambino's mercenary advice was precisely what he needed to turn the tide of the battle but it almost wasn't enough. If it weren't for Chitch's spirit summoning the wind to blow the arrow towards the back of that fatass, Guts would've sustained another wound and everything would've gone downhill.
That two-faced asshat Martino actually came back with reinforcements in a twist of fate thanks to Guts acting as a decoy. I guess that's how it was and that might've been the better outcome because if it weren't for his stunt, he wouldn't have been fully healed and they'd all be working hard labor until their last breath. Guts keeping his promise about helping his friend find new friends was very bittersweet but her memory will always leave a tiny but warm mark on everyone who knew her.