Moss made very few errors IIRC. A very tidy keeper. Some debate about speed off his line, distribution and in the air, but he consistently ranked better as a keeper than we did as a team.
But to assess his worth we need to know what he cost. I have no idea but without that fact it's impossible.
Very. He's an exceptional shot stopper, but his distribution is not strong (the long punt up the middle or the long kick up the middle) and he was never a commanding presence on cross - he really didn't come out for much at all. I think he can be replaced
I agree. Good shot stopping alone would be expected from a young, athletic keeper, and Italiano would (should) be just as good at that.
The other skills you mention (organising defence, communication skills) are developed with age, time and exposure to playing at a decent level, if the individual potential is there. While I am not sure if Italiano has that potential or not, I am prepared to give him a chance to prove it rather than just cutting him loose, unless he wanted to go elsewhere for a guaranteed starting spot / better money / family proximity / etc.