His biggest mistake was 30 minutes in. If there are still nerves by that point, then I fear you're right and he is nowhere near ready for first team football. At any level.
I'm not wanting him punted, I'm merely turning folks excuses back around on them.
Yes, it was wrong to select him with hindsight - hindsight of his own performance. Yes he's young - but so are other who have excelled.
He got a chance to show what he can do and he failed to grasp that. The majority of that is at his own two feet.
Same as Kerr. Same as Marshall. McDaid, Callachan etc etc etc. They're the ones who are being paid to go out and do the basics right and take it from there. They all failed. They all deserve ridicule, no matter your age or standing in the squad.