It is interesting to see how styles and masters take same principles and oftenly similar movements and fill them with different meaning (practical application). "I" can lead qi only when you exactly know what you are doing in fighting situation and clearly imagine that.Problem is dogmatism -there are many "sure" answers -but they doesnt work, realistic attacks are very different from imagined, nobody does grab your wrist when attacking, low stances are impossible at winter and so on.