Flaws in your squat technique will hold you back from progressing. Overhead squats can improve the squatting pattern and should be a regular part of your strength training program.
The overhead squat requires a more upright posture than the back squat and you're forced to execute the squatting pattern precisely, otherwise the bar would drop to the front or back.
Have a look at the video. You can see the high concentration level of the athlete and accurate execution.
Endurance training may make you leaner, but it'll eat up muscle, damage your cardiovascular system, elevate cortisol, put you in an acidic state, and might just kill you.
I have to admit, I debated long and hard about running this interview. Don't get me wrong, there's nothing wrong with it and I have nothing against Dorian Yates.