Let's be honest bro, Lamar has been quite inaccurate so far during his short career, and he knows it often looking frustrated after missing throws he would love to have back. It's hard with little to no time in the pocket, receivers missing assignments drops etc.
I agree Lamar has a higher ceiling than Kaep, I laughed when the 49ers gave him his big extension but argue with his ability to do what he did when the 49ers were a dominant team. Once they declined you saw Kaeps talent start to fade due to losing Jim Harbaugh a top defense and a lot of offensive weapons.