I honestly don't see us getting either and instead us getting Ramos. If we were to get koudibaly or de light we are talking about somewhere near 80m. Add that to pogba/savic it's almost 200m. I don't see us spending that much this mercato.
Who's knows, maybe management will go all in this summer with reinforcements. It could make sense given they decided to move on from Allegri. If the coach is Pep, maybe they told him that they want to win the CL next season or it's a failure. Then again to put that kind of expectation right away on a coach is a lot.
Koulibaly > De Light right now imo, and Koulibaly is still young so we can improve even more, would not complain with either but probably lean towards Kouli, guys a monster, perfect Chiellini replacement