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When sheathing is configured such that panels wrap around the openings in a C- or L-shape with no seam between the corner pier and the opening pier or central pier, shear is transferred through the sheathing rather than via the straps and blocking, and the assumptions of the Diekmann method are not valid. Tests have shown extremely large differences between actual forces and those computed by force-transfer analysis in this case.
Shearwalls does not consider sheathing layout details (other than whether the panels are applied vertically or horizontally). It is the responsibility of the designer to ensure seams exist on the studs at the sides of opening segments or on the force transfer blocking so that force is transferred through blocking and straps rather than sheathing.