Why Lee didn't influence Clem that much.
Lee is probably one of my favorite walking dead characters. He's so relatable and charming. Hell I'd even put him in my top 20 favourite video game characters. But many people think of him as the person who taught Clem everything she knows on how to survive. Before I start going over I'd like to say that he did give the foundation for Clem's thinking when surviving but a lot of it is actually down to others.
Time: Lee and Clem's time together was very short. They were together for around 4 months. Now she learnt a lot in that time but take Christa for example. Her and Clem were together for 2yrs, Clem saw Christa losing her baby, that must have shaped her a lot. There's a lot we didn't see but it's safe to assume that Christa shaped Clem a lot. She would have developed a deeper emotional bond with Christa will all they went through together.
Survival skills: A bulk of Clem's knowledge really comes down to Kenny, Jane and Christa. Jane taught her a lot survival skills, taught Clem that she could take care of herself. The knee kick technique is still being used by Clem. Kenny taught her how to drive, he taught her how to kill someone you care for if needed (if you choose to shoot him). Christa taught her to attend to a fire and such. A lot of her maturing was done around the s2 cast, so they would have influenced her. The stuff that Lee taught her, the majority of it was suggested by Chuck.