Kogorou does notice he doesn't remember anything, I remember at the start of one case that he repeatedly played a case he actually solved and remembered because he was proud he managed it. That shows at least some awareness, right?
Btw, people wondering why Haibara and Agasa don't team up to create an antidote, Agasa isn't the right type of scientist, he's more into the mechanical and engineering side of things, whereas Haibara not only worked on the APTX, but knows more about the medical and chemical side of things.
Yuusaku has contacts and a lot of influence. Also, considering that he knew Kaitou Kid's identity and never did anything about it, his view on which crimes are acceptable probably means that he would use illegal means like faking passports to get Conan out of the country if necessary.
The Kogorou always sitting down, that... isn't quite true, there have been some times when he's been lying down or in really awkward positions (like when he nearly fell off that balcony when he was tranq'd). However, it is for the most part, correct that he lands in a really convenient position when darted, I put it down to just a plot mechanism you're not supposed to question, one of the proper plot holes of the list...