It's not simply LBJ avg a triple double that would get him the Finals MVP; it would be combo of if Davis' is leading them in scoring but hardly rebounding or assisting and lebron is only avg less than 3 or 4 points less while still getting 10+ boards and 9+ assist. Let's take their last series stat lines for example
Davis 31.2 ppg 54.9 FG% 6.2 rbs 2.6 ast
Anthony Davis Game by Game Stats and Performance | ESPN
Lebron 27.0 ppg 52.9 FG% 10.4 rbs 9.0 ast
LeBron James Game by Game Stats and Performance | ESPN
Lebron's line in undeniably better even while avg 4 less points.
The reason why? Lebron has to get everybody else involved while Davis can solely look to get his offense/play as a finisher