It's not at all surprising: the seeded the winners and the three highest ranked teams to make it impossible for them to meet until this stage if they won their group in the group stage, with the group stage having its own seeding system to make it very winnable for them.
They also missed a potentially tricky first knockout round tie against local rivals Uruguay because Uruguay underperformed and Cape Verde unexpectedly overperformed.
They also missed a potentially tricky first knockout round tie against local rivals Uruguay because Uruguay underperformed and Cape Verde unexpectedly overperformed.