In the case of Riker v William, neither are the original at that point, but the one stranded was the “more” original, especially given he hadn’t used a transporter in 7 (I think) years, while Riker continued as normal, dozens per month for years.
Again, they both still are William Riker. Just one is “more” original.
Would that even be the OG Riker in your scenario? He’d have almost certainly have used the transporter many times before then.
In the case of Riker v William, neither are the original at that point, but the one stranded was the “more” original, especially given he hadn’t used a transporter in 7 (I think) years, while Riker continued as normal, dozens per month for years.
Again, they both still are William Riker. Just one is “more” original.
It’s a real ship of theseus situation.