Remember the lower charges go the worse off EI will be as FR will be able to cut costs even more and widen the gap while EI are always trying to drive up yield. EI have done well over the last few years while FR were kept at bay. They are feeling the pinch already especially this coming winter.
I know there is other reasons for EI doing well but their SH operation annually does not make major profit and with increased presence from FR it wont help as EI are on higher chargers as it is.