It isnt overkill for two reasons. Firstly we wont play 4 man defence but 3 man CB one (otherwise signing makes no sense).
And secondly, he is better then Rugani.
And I repeat, Barzagli is 35 with two year more on his contract, how long do you expect him to play in this standard and dont you want to get his replacement while he is still around instead of scramble for replacement and get scraps because you didnt plan ahead? Barzagli, Licht and Gigi are three major rejuvenation needs for us, and last thing we need to do is address it when its too late when they are about to leave/declined/physically spent. Better to do it like this while they still here, like we did with Evra with Sandro signing.