Why the Sea Fury advanced while the Martin-Baker MB5 did not

Why was the Martin-Baker MB5 not pushed forward when the United States was fielding aircraft such as the Bearcat and Skyraider?

The Sea Fury was the better service aircraft, and Martin-Baker had not shown that it could scale the MB5 from design work into dependable mass production.

Experimental promise must be separated from a manufacturer's ability to deliver an operational fleet. The Martin-Baker MB5 looked excellent on paper and embodied useful design research. The Sea Fury is judged the better aircraft for the service requirement. Martin-Baker later became highly successful in ejection seats, but at the time it had not demonstrated the production capacity needed to turn an interesting fighter design into a large, reliable service program.