No, cuz Davids and Tacchinardi doesn't play the same position. They're both starters, and if Davids is gone and Appiah is injured, Juve is still one man short.
then we have maresca and tudor, cause lippi wont play him in defence. besides, you can't rely onm him top be first team defender. but probably he will be injured too. so it'll be conte. we have enough depth, but if davids is sold we need more.