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For a leader to openly disagree with his shadow foreign and defence secretaries is on a different level to Labour divisions over Iraq or to Tory divisions over Syria IMO. If MPs were always to make their own minds up then we would have a parliament full of independents but we don't: in a political party you have got to broadly be singing from the same hymn sheet especially amongst the party leadership. It's important to have that coherent and united party view or the party means very little. Corbyn himself realised this because he tried to force his party to vote against strikes but that has backfired miserably. Corbyn can't just be granting free vote after free vote because that will either make his position as leader untenable or it will make a lot of his shadow cabinet's positions untenable: something will have to give.