one thing about danny is i am putting a character on the island from lost. mel king is, of course, good in a crisis. when jack goes off on his frequent dangerous missions and treks across the island that last days, she is the doctor who can hang back and make sure no one dies in his absence. she spends time with claire and the baby, kate, sun and her garden. and she's not throwing punches like jack, not fighting to lead the survivors, just doing her job and trying to keep as many people alive and healthy as possible. so that's probably good for one of the doctors to doing.
alex karev is throwing punches and picking fights with jack over course of treatment and use of resources and everything, just everything, because he doesn't like his self-righteousness, his tone of voice, how he's appointed himself in charge. he's having homoerotic fights with sawyer, too, both physical and just yelling at each other, until they tire each other out and end up drinking on the beach again. he has few other friends, and sawyer isn't really his friend he's just his fucked up boytoy. he's generally unlikable, but maybe kate can stand him, maybe charlie, maybe shannon. he definitely thinks whatever's wrong with desmond is funny.