David had been training with stones and a slingshot killing predators and keeping his sheep alive from his youth. Why would He put on SOMEONE elses armour and SOMEONE elses weapons to claim the next bigger prize if that is not what God had been training and preparing him with. Use what God has been training YOU with not what God has been training SOMEONE else with. Use YOUR armour God gave YOU. The next journey, season, level will be in the same category but bigger. Use YOUR gifts YOUR personality YOUR training be who God created YOU to be. How can He ever work with YOU and give YOU oppurtunities if YOUR always trying to be someone He never intended YOU to be.