I've been using my 6+ naked except for an Armor Sheild Ballistic Glass screen protector. To add a little extra protection I recently purchased a Tech21 case. While putting the case on, I noticed that glass screen protector sits just about level with the height of the of the case's lip. Is my screen protector defeating the purpose of the case by exposing the screen to the direct force of a face-down drop? What are the chances of shattering both the screen protector and the glass underneath?