[3] Gustafson had continued to feud with Ellsworth and Verni within the next two-and-a-half decades, and claimed on his Facebook account in March 2018 that he had not received his share of royalties for his songs with Overkill.

"[5] Following the release of the second Overkill album Taking Over (1987), Gustafson was approached by Megadeth co-founder and band-leader Dave Mustaine to join his band, following trouble with their lineup at the time.

[1] Gustafson claimed in a 2020 interview on Exodus frontman Steve "Zetro" Souza's Toxic Vault podcast that he auditioned for Metallica as James Hetfield's temporary replacement, following the latter's recovery from being burned onstage during their 1992 tour with Guns N' Roses, but lost this position to then-Metal Church guitarist and one-time Metallica guitar technician John Marshall.

[3] Gustafson returned to the music industry in 2003 by joining the Florida-based band Response Negative, and has released two albums under the moniker Satans Taint: Axe to the Head of My Enemies (2017) and Destruction Ritual (2019).

[9] He was eventually confirmed as a permanent member of the band, and appeared on their first song in more than two decades, a cover of Dead Kennedys' "California über alles".