It is very disappointing to me as well that ABT refuses to hire Tudor's former assistant, Airi Hynninen. She notated many of Tudor's ballets and knows them inside and out -- and more than just the steps.
I saw Kathy Moore first in 1987 when ABT was in Los Angeles. I thought she was bland then but by the time she last performed the role in 1991 I was moved by her performance. It does require time, thought and repeated performances, but Hagar in my opinion requires a more dynamic, even volcanic dancer than Kent, perhaps with a more mobile torso.
I also loved Leslie Browne and Magalie Messac in the part. I saw Cynthia Gregory's one and only performance and was impressed, although Tudor was not. Lise Houlton was also a first class interpreter of Tudor as Hagar and Caroline, et.al.
I was always at the edge of my seat watching Pillar of Fire -- until this season. McKerrow's second performance was vastly improved, however.