[vinay_ys]

The personal traits required to find a job are different from that to perform well at a particular company & role. That's the sad truth. So, people voluntarily leaving won't be correlated with performance low or high. Also, people who were selected for layoff by management will also not be correlated to low performance well. In fact, in most layoffs, they are planned in closed rooms with only VP+ people who have little context of who does what work well or not, and with flawed performance calibration data. So, you will always be shocked to find that the people /you/ thought were high-performers were let go.