SOLVED? 3 GENERATIONS KILLED. Was the wrong man convicted?

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It was 1999 in South Wales when the Power family would be found. Mandy Power and her daughters Katie and Emily lived in Clydach and their house would go up in flames. But it would be found that they had been killed prior to this. The only motive the South Wales Police could find was that Mandy had a lover named Alison Lewis who was a married woman. Her husband was one of their own, police officer Steven Lewis. Although, no evidence was found to connect him and he was quickly released. Then a witness would come forward saying that she had seen a strange man in the area that night. This sketch resembled Steven Lewis but he wasn't the only one, he had a twin brother named Stuart Lewis who was also an officer. However, David Morris would be the man arrested for the families murders. Many in the community believe that this was a cover up and David was wrongly convicted as an innocent man. This theory is mainly believed due to the past actions of the South Wales Police in other cases of miscarriages of justice. Including the murder of newsagent Phillip Saunders when Darren Hall, Micheal O'Brien and Ellis Sherwood would be imprisoned for 11 years as the Cardiff Newsagent Three. Also, the murders of Diane Jones and her two daughters Shauna and Sarah Jane. Donna Clarke and Annette Hewins would be jailed for 3 years before being released. The most infamous however was the murder of Lynette Deborah White whose murder would lock up the Cardiff Three who were Stephen Miller, Tony Paris and Yusef Abdullahi. The real killer would be found years later as a completely different man, Jeffery Gafoor.

SOURCES:
https://www.youtube.com/watch?v=RkSdT9j_mOM
https://podcasts.google.com/?feed=aHR0cHM6Ly9hdWRpb2Jvb20uY29tL2NoYW5uZWxzLzQ5MDQxMjcucnNz&episode=dGFnOmF1ZGlvYm9vbS5jb20sMjAxOC0wOC0yNzovcG9zdHMvNjk4MDkzOA&hl=en&ved=2ahUKEwiK67rQw_rnAhVHRa0KHdQeAIQQjrkEegQIARAE&ep=6
https://www.theguardian.com/uk/2003/nov/23/ukcrime
https://en.wikipedia.org/wiki/Murder_of_Lynette_White
https://en.wikipedia.org/wiki/Cardiff_Newsagent_Three
https://www.dailymail.co.uk/news/article-2845510/Who-REALLY-murdered-married-WPC-s-lesbian-lover.html
https://www.walesonline.co.uk/news/local-news/new-evidence-emerges-cardiff-newsagent-9784611
https://www.youtube.com/watch?v=kio7JbHTv0c