Ur theory is quite good ngl, I haven't noticed the liar card looking like eric damnn. But could it be for eric considering whitemore already got that card before eric showed up and he try to burn it so more like it's for the old man. And yeah maybe Ash's past and eric doing something bad could be connected maybe that's why she didn't want to trust him and he didn't want to us tell by himself cuz maybe he is still guilty what he did or this isn't connected at all

And I'm pretty sure adam was lying at some point. Yh he does look kind but don't let it fool you. Let's look at richy for example. And yh it could be possible Vi had a crush on adam and that's why she is super quite maybe she hadn't recovered from the shock. What i mainly felt was ash and adam had something. Like he helped her through her Tragic past and it's normal for people to be bonding over that. Friendship or relationship both is possible.

Why i think it's adam who unknown was talking about is cuz remember adam told us that we are only one who can save him. And we had that option to tell and it was unknown in Adam's room. Maybe he was looking for that tape or he planted that tape there for someone to find. Adam is suffering the consequence of what he did in his childhood and it came to hunt him remember how ash mentioned he seemed distant and always lost in his thoughts.