My final two picks: Elektra and Mary Marvel (evil)
At the very split second Strucker is shot in the head by Nick Fury in Secret Warriors, Loki freezes time and pulls him out. They travel to some nexus of realities where they start recruiting villains to help them take over Earth-523, where Hydra is poised to take over the world. In this timeline, Strucker replaces his counterpart, a weakened and dying Strucker who was severely injured in a battle with Nick Fury (who he killed). Obviously Strucker is in charge of the Nation of Hydra, which thanks to Loki's mischief, now teeters on the brink of ruling the world or collapsing on itself. Talia is Strucker's second in command, having experience running both Lexcorp and the League of Assassins. Tao handles the operations of the two teams and Hydra's army. Wizard is Strucker's chief science and tech guy. Those three are the Baron's inner council. Mystique leads a covert team of Ghost, Deadshot and Elektra, who are Cerberus, Hydra's black ops. Ingrid Weiss leads the Chimera, consisting of the Apocalypse Twins, Jet Black and Evil Mary Marvel who are the Hydra field team.
The whole thing is being manipulated by Loki, who is figured out by Tao. Tao instead keeps it to himself but starts making plans to overthrow Strucker. He convinces Uriel to sabotage the Chimera by getting between Mary Marvel and Jet Black. Eventually, Talia begins to suspect something so she has Cerberus investigate Tao. Ghost learns of Tao and his intentions to overthrow Strucker. He joins Tao and helps sabotage Talia by making her think the Chimerae are planning to overthrow the Baron. She has Cerberus attack the Chimera with intentions to kill them. Tao tells Ghost to spare Uriel but Eimin learns of his betrayal and kills him and Ghost before Cerberus kills the rest of Chimera.
Meanwhile Strucker develops the same illness his replaced counterpart had so he asks Wizard to fix it. Tao manipulates Talia into believing that Wizard is trying to kill Strucker, so she sends the rest of Cerberus to face him. Wizard figures out why Strucker is dying, because Loki poisoned him, but before he can do anything he is attacked by Cerberus. He kills Elektra and is then killed by Deadshot, and as Mystique takes Wizard's research, Tao kills Deadshot. Mystique barely escapes and she leaves the info for Talia, but Loki then kills her and tells her she's going to ruin the fun. With Tao distracted, Talia finds the info. She takes it to Strucker but before she can tell Strucker, she's killed by Tao. Loki then pops in and conveniently kills Tao by disintegrating him. He then tells Strucker it was all a game as zombie SHIELD agents (lead by zombie Fury) break into the baron's room in Hydra Castle. He jumps to his death and as he's about to hit the ground he wakes up at the very split second Nick Fury is shooting him in the head.