It depends. There are many variables when issuing a full cave cert, and some of them are subjective. I rely heavily on the "loved on principle" before I ever issue a cave cert. Here's an example.
I've had a student that had amazing awareness, equipment management, buoyancy, trim, could run a reel like a champ, etc. He had previously taken intro and barely had a frog kick when he finished it, and he spent months practicing to get his frog kick down and had a beautiful frog kick by the time he took full cave. He's an older guy though, and he simply can not do a back kick because of some mechanical issues. I had no qualms about certifying him full cave.
I've also had a student that had great buoyancy, trim, propulsion techniques, could do back kicks in circles all day long, could managed his gear, but lacked awareness of where he was in the cave. He failed.
I've had a student that had amazing awareness, equipment management, buoyancy, trim, could run a reel like a champ, etc. He had previously taken intro and barely had a frog kick when he finished it, and he spent months practicing to get his frog kick down and had a beautiful frog kick by the time he took full cave. He's an older guy though, and he simply can not do a back kick because of some mechanical issues. I had no qualms about certifying him full cave.
I've also had a student that had great buoyancy, trim, propulsion techniques, could do back kicks in circles all day long, could managed his gear, but lacked awareness of where he was in the cave. He failed.