Can a player have a bad training camp one year and a good one another?

According to jdb, no.

I have seen a player drop slightly their first camp, switch positions, and start gaining (slightly) but it's rare.

The only good will be they wont drop as much the next season .. Lol

thanks guys i thought so.

I thought he said they could but it would be very minor like this guy.https://mfn1.myfootballnow.com/player/16003

If you look at his progression the First season he went up a little , 2nd down a little , and third back up a little again. I see mostly with low volatility players