But It Would Have To Be In An AU Where Theo Was Not At All Like In-universe Theo - Tumblr Posts
@rhyslahey you are so right for this. Isaac would have already knew Theo was fishy from the start. It would take time for him to put the pieces together yet he wouldn't like Theo even if Scott knew the latter since 4th Grade.
Plus, Isaac is by Scott's side and would not let anyone harm his boyfriend closest friend and the one person he truly trusts. Yes they have similarities, they are both victims of abuse, both are traumatized and have suffered psychological damage, but Isaac regained his compassion and trust through Scott. Theo's murder on Scott would have Isaac assault Theo to the point of death. Forget what Malia did to Theo, Isaac would have murdered Theo for killing Scott and harming the rest of his pack.
The only way I could see Theo manipulate Isaac is by him using Allison and her death as a way to harm Isaac and torment him which would disorient him from stopping Theo. Because honestly Isaac would be Theo's biggest obstacle after Lydia.
In another AU, like my planned Good! Theo Raeken AU where he is with Scott and Stiles as a Chimera while Tara is presumed to be "dead", that I can see Isaac and Theo be together since this Theo would be more compassionate and trustworthy unlike his canon counterpart.
I still can't believe how Theo and Isaac never met. Those two would be best friends in a heartbeat like bffs for life, ride or die. Jeff really robbed us from so many things ðŸ˜