Max tried many players, tactics and systems.
Berna was tested in midfield and forward roles, he did hood indeed, but never managed to become a starter and convince the coach to prefer a system that fits him.
Maybe he is poor at training, or Max was biased against him, we will see.
Apart from that, it is very easy to make a great impression in a smaller club like the Viola and Roma, but it is hard to repeat that in a club like Juve, i think this is what he means to say. Ppl tend to have sky high expectations will be disappointed.
As we are unlike to get another quality AMF and the injury prone Ramsey would be our primary choice, Zaniolo would surely find his way in soon when Ramsey will be out and other player is equipped for that role