You'd have to assume at this point that Chief is happy Colakovski is giving something over and above what he sees Ball doing and is more deserving of a place in the squad.
I personally have to agree, I don't see any reason why you'd be dropping a player like Cola given his performances so far, he's not done much wrong and has contributed to goals in very limited minutes. Ball clearly hasn't been able to match that in Chief's eyes this season in training and in the reserves and I don't see any reason to doubt Chief's judgement on this. Cola was certainly a better performer in the A-League than Ball was last season and Bally is only slowing down.
I personally have to agree, I don't see any reason why you'd be dropping a player like Cola given his performances so far, he's not done much wrong and has contributed to goals in very limited minutes. Ball clearly hasn't been able to match that in Chief's eyes this season in training and in the reserves and I don't see any reason to doubt Chief's judgement on this. Cola was certainly a better performer in the A-League than Ball was last season and Bally is only slowing down.