What if Dr. Brenner is still alive , working with LT. Sullivan, the man who wants Eleven dead?

In Stranger Things season 4 Vol.2 Episode 8
, Doctor Mike Brenner , the man who imprisoned and abused Eleven, appears to meet his fate from a sniper. However, what if LT. Sullivan(Sullivan’s men shot him) captured him and “Papa” is still somehow alive , and is hunting El with the help of LT. Sullivan.