You just listed 2 guys who put in no effort to better themselves after signing their initial contract. Leaf stopped giving af even before he was drafted. He got fat before the combine. Manziel basically stopped caring about football after his first year at A&M. Both of those guys were un-coachable because they just wanted their one pay day. Caleb already made his money through NIL yet cared enough about not winning a Pac 12 title in college that he did what you posted in that GIF. He's shown that he wants to be prepared and wants to win at the NFL level by working with his coaches to adapt to Waldron's offense even before being drafted. Those points alone should show you that his problem will not be the same that caused Manziel and Leaf to fail at the NFL level. Those guys didn't care about what happened after they got drafted. Caleb Williams has not shown me he doesn't care. If he fails at the NFL level, it won't be for the same reasons why Leaf and Manziel failed.