That is true, but Croatia is the first in the ranking of third placed teams. You have 12 point and a +9 gd, behind you is Ukraine with 12 points and and +8 gd, Albania, Hungary with 11 points and Russia with 10. That's just to walk straight into the Championship. But you are assured 100% to have play offs in case something goes wrong in the remaining two games. I'm sure we'll see you there in 1 year good luck!