Got a sour sweet idea about Jake and Kiri
So Na'vi connect their queues for emotional bonds and through the bond you feel what the other feels, right. Well, what if in Fire and Ash we got a scene where Kiri gets so frustrated that Eywa won't hear her, and frustrated that she can't connect to the Spirit Tree, that she storms off and after awhile Jake goes to comfort her and he connects his queue with hers and thinks back to the time he was a paraplegic on earth. Cause I feel they could relate with the overwhelming feeling of 'Why can't I just do this!'
I'm not paraplegic but I've already gone through kidney failure at 18 and lucky enough to get a kidney transplant. Anyone who goes through such a dramatic life change, especially involuntary ones like fucked genetics or unpredictable traumas, will go through that frustrated depression. I know Jake never wanted people to take pity on him, but that attitude is something you build up. He also said in A1, he was sick and tired of doctors telling him what he can and can't do. So I'm sure in the beginning of having to literally rearrange his entire life and how he functioned he probably got to the point where he felt unheard and like he was fundamentally failing at the one thing 'normal' people can do.
It'd just be kind of sweet if we heard how Jake felt about that time or how he looks back on those kinds of things and how it could bring him closer to his kids. (Hell, maybe this exact same scenario could play out with him and Lo'ak so Lo'ak could see, literally, through his dad's eyes with the point of "I was reckless too. I also thought I was damn near untouchable, and it cost me. I don't want it to cost you.")