Hi David
I dont really have the answer about why Jesus still had to learn obedience by the things he suffered
Its interesting thou the Lord moved my hand while reading the bible one night, and underlined that passage and some others.. my theory why Jesus learnt obedinece by the things he suffered.. maybe He still had to yield His will to the father.. may have somthing to do with the human aspect of Jesus and maybe his life before he was baptised