Why Incomparable falls short of the fast-battleship label

Would HMS Incomparable qualify as an early fast battleship?

Not under the period standard used here, because her projected 27 knots remained below the roughly 28-knot cruiser speed used to define a fast battleship.

Incomparable could be advertised as an unusually fast battleship, but her projected 27 knots would miss the operational threshold used by major navies. In this framework a fast battleship had to keep pace with contemporary cruisers, which placed the dividing line around 28 knots or more.