The Orthodox Church has given the label of "Theologian" to only three men; St. John the Evangelist, St. Gregory Nazianzus, and St. Symeon the New Theologian. I'm on their team, so I go with them.
It's evident there are many more men versed in Theology, but only three in the last 2000 thousand years earned the Title.
Theology is the most important consideration, since if God exists, nothing else matters; and if God doesn't exist, nothing else matters. In the first case, nothing is more important than discerning the Will of God. In the second case, one will busily spend all their time filling that hole.