Yeah, Mayfield is confident, But he doesn't bring the other baggage that brought Manzel down. Manzel was his own worst enemy. Mayfield isn't.
I don't know or have any insight into Mayfield off the field that isn't public knowledge, but Manziel's off the field was well known by everyone. The Browns paid six figures for a background check on him and knew he was an idiot, but selected him anyways. Manziel was a trainwreck.
Manziel was drinking during games. He was always partying, doing cocaine, even smoking. Everyone just kept giving him a pass. He was doing it around everyone. People he didn't really know. He just didn't care. He wanted to party. He was completely selfish and immature. He was in denial about himself.
Mayfield got caught up in a situation where he was drunk and couldn't follow an officer's direction while the officer was looking into someone else's crime and ran, probably because he was underage and scared of getting busted for being drunk. Stupid, but not in the same league as Manziel.
Could there be more? Perhaps.
Even now, after working up such a big sweat yesterday, underage Darnold talked about wanting to get 'dirty' last night after the combine. Now does that mean Darnold will be a big party animal? Don't know. But if anything it doesn't look good. If anything, people should maybe take a closer look at him as well.