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Fw: roof truss daiphragm forces

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Dennis ,
This is a 40x36 2-story garage  with a 5:12 roof slope and 2:12 ceiling vault with gable end balloon framed to the roof sheathing. They are mfg 2x light wood trusses.  I talked with him an he was worried about the tension forces across the ridge in the truss members due to internal stresses caused by diaphragm action.  I called out for 3x blocking at the ridge so both roof plywood planes could be nailed together. 
seems like this plan checker is looking too deep