Board Thread:Questions and Answers/@comment-10922879-20130617143901/@comment-5657895-20130627195529

Meh, Starrk was smart and level headed at least. Halibel was kinda... meh. Like, nothing was highlighted about her. She wasn't particularly intelligent or super powered.

Starrk had a lot of raw power and the brains and the calm to back it up. Barragan was probably stronger, but he was short tempered, arrogant, and narrow minded. Plus, with his grudge against Aizen, it's no surprise Starrk was put on top. Course, if he knew about Ulquiorra's full power it may have been a different story.