Agincourt could redirect the Revenge class

Would the Revenge class be built historically if an 18-inch Agincourt already existed?

Some ships might instead copy Agincourt's 18-inch armament, potentially giving the Royal Navy three such capital ships.

A completed Agincourt would give Britain a working 18-inch capital-ship precedent before the next wartime construction choices. Some Revenge-class hulls might repeat that armament. Their lower speed would remain, but the larger guns could be treated as the compensating advantage. The Royal Navy might then have three 18-inch-gun ships rather than one isolated experiment.