re: Karate Kid 3 better than 2?

Terry Silver is supposed to be Kreese's buddy from Nam. The actor who played him was six months older than Macchio. The actress who played Macchio's "love interest" was eleven years younger than him. Since she was 16 and Macchio was 27 they had to re-do the script because this wasn't a Luc Beeson movie. Why they didn't just cast a 20 year old, who knows.