By the word enthnocentric I mean everyone in the Watchtower culture or milieu,, since they are a part of a worldwide organization ethonicity . And I would also conclude they are also very egocentric.
As far stages of human development that is only 2 rungs up the ladder 1)ego 2)entho. They have very little growth spirituality and actually are at the bottom of the heap. Jesus cannot be their rule model since they interpret accounts of him in a very egoistic way(giving them authority as his chosen Faithful and Discreet Slave). Also they are very restrictive in who they view as Jesus brother's(144,000) limiting such to only those that have the same interpretation as them which make them extremely ethnocentric.
They are definitely on the 3rd rung which is world centric, unless you view a egocentric view of the world as worldcentric.