Because he's not good enough as a no 1 Premier League keeper? No idea how good the Charlton keeper is but he looked distinctly average yesterday, I am used to seeing GREAT, world class even, saves from keepers when they play against Brighton.
I only had a quick look at the Leicester goal against us and I think Kuz should have done better, I may be wrong but lucky Bruno wasn't on the pitch to berate him
Hamer is, um, OK. Prone to mistakes, but keepers are supposed to get better with experience. He (usually, not yesterday) has good distribution of the ball. He is out of contract at the end of the season so it might make economic sense for Brighton.