1vwt+1kEkmqC8 LL6 often are disallowed by higher ups from purging useless GSRs as they are being protected by LL5/LL4/LL3+. An LL3 use to send around yearly lists of GSRs that were cascaded down to LL6 my husband (now retired) was required to take as many as he had open slots, even if the GSRs had zero skills or interest in the area. This is how LL6 get stuck with non-contributors. The best they could do is to pick up non-devious/non-evil GSRs (pleasant space-wasters). People learned quickly to not have any open slots.
One specific example when Ford outsourced security guards years ago, my husband was required to take one. He was an IT LL6 over a highly specialized group, the security guard had zero ability or inclination to learn. That GSR sat doing nothing for 19 years and retired with a pension, my husband was told the GSR was a permanent addition to his team, every time he tried to find him a more suitable position. In the end the guy was making $115,000 to sit and do nothing.