see I would put it this way
Gaurdian: Forms I, II, V, VII
Sentinal: Forms I, III, IV, VI
Counsular: Forms I, IV,VI, VII
Sentinal: all the forms are balanced (neither heavy combat nor defense).
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form three is VERY defensive. it even said obi-wan chose it because gui-gon didnt have a good enough defense
i choose form 3 becuse i like obi-wans style