i think its a good idea what lippi is doing, because although zambro is a right winger, everyone can see that he is a natural left sided player. If you see what he does, he always uses his left foot for crosses, and even when he plays on the right, he cuts in and shots with that foot.
Now, he is playing at left back at the moment, but he is basically going to take that left side of the park anyway, as Davids plays in that diamond midfield. However, with Camoranesi on the right, Zambrotta is able to play on that left anyway and now juve has two good wingers again. Pessotto is a good defender, but hasnt got the abilities of zambrotta, as in passing, crosses etc...
now, as for moretti.....he is too young and still needs a few seasons. personally, i would rather buy a player such as Armand or Zauri for that left back and use zambrotta on the left.
eg. camoranesi nedved davids zambrotta
to me, that looks like a more balanced midfield. but it does lack one thing, and that is height, and thats what gives Tacchinardi his spot in the team.
And Davids wont be around in a few seasons time, so for the future of moretti and zambrotta etc...i think it should all work out fine, unless moggi invests in a left back.