Besides, 2.7 was given to Towne32 since Harmy had done most of the pre-3.0 work he was going to do on SW, with ESB Harmy is still actively working on bumping it to what should be the last pre-3.0 version, and ROTJ was a very recent product (that is, his work has been getting better with time, and SW was, by far, the oldest project of the bunch and was more open to some improvements). At this point, once ESB versions up to match the style (lack of GOUT) of the rest of the films, it is all v3.0+ from here out.