Fonte is actually a good CB and developed in the challenging EPL. he also plays for the second best team in France. You are right, a defence is more than the some of its parts. I tried to give you a break but here goes;
No. of players who play in top 5 coefficient leagues for each of the aforementioned national sides;
Iceland (4 players out of their 25 man squad)
Switzerland (17 players out of 25 man squad) they are decent
Japan (4 players out of 25 man squad) they are clearly world class
Greece (5 players out of 25 man squad)
Mehico (5 players out of 25 man squad) excellent team who cannot even reach the final of the last Gold cup ahead of my beloved Jamaica
and average 10th in the Copa America places
Tunisia (7 players out of 25 man squad)
Now we all know there is great discrepancy between the quality of the leagues from 1-5 but I have included all top 5 leagues for fairness.
Is this fair enough?