Invincible's lead yard could launch last

How could Armstrong be the Invincible class's lead yard if HMS Invincible was laid down and completed last?

The lead yard prepared and coordinated the detailed design, but drawing review, other yards' input, slip availability, and existing work determined each ship's construction dates.

Armstrong Whitworth at Elswick could remain the lead design yard even though HMS Invincible was laid down and completed after her sisters. Producing detailed drawings, circulating them through the Director of Naval Construction and the other yards, incorporating responses, and waiting for a building slip could all delay the lead yard's own hull. Design leadership and construction chronology were separate parts of a multi-yard naval program.