Should Rattler be our starter in 2025? (merged)

No.

Rattler so far looks like nothing more then a career backup. He's slow to recognize the defense, he's slow in anticipating receivers becoming open and he's oblivious to disguises. I can't recall a time when these issues were fixed in a QB at the NFL level to become a quality QB1. Otherwise QB's like Nick Foles and Winston would be hall of famers.

Did you not see Sam Darnold and Baker Mayfield play as rookies or for that matter most other good QBs? Rattler may or may not develop into a good QB but what you just described is playing like a rookie QB. Lots of guys have had those issues and turned out to be good to great QBs.