Maxperson
Morkus from Orkus
James Doohan made Scotty. He WAS Scotty. The only way to be more Scotty than Doohan is to be a better Doohan doing Scotty than Doohan was.It's very much not "like" that lol.
Scotty was not ever a real person. That's genuinely important to remember because clearly there's seemingly some confusion here, given your insistence he is the same as a real person.
He was a character on a TV show
That's different from being a real person.
If I'm not real to you, just another fictional character because I'm a poster on the internet, well, I can't help you there!
But having an actual Scottish accent, rather than... whatever Doohan was doing... plus being a more capable actor (which, sorry, he clearly is imho), and just being more convincing as a "highly inventive, paradigm-shifting engineer" adds up. The first person to play a role is not always the best! (Even ignoring examples with pre-existing characters, i.e. all the Marvel, GoT, etc. examples, c.f. Becky from Roseanne, Ann from Arrested Development, Reggie from Riverdale, Carol (Ross' ex-wife) from friends, and so on.)
It's fine to prefer Doohan, I mean, some people prefer Aunt Viv 1.0 in The Fresh Prince (I am one of them), but you actually can say a new actor in the role is better at it than the originator, because the role is a role not a person. Hell with Shakespeare I am very confident there are even parts written for specific actors at the time that have been played by other actors "better" truly countless times since.
Other actors can do Scotty differently, and very well, but they can't be a better Scotty than Doohan. At best you can like the differences in the new Scotty better than the original, but that doesn't make him better at being the original than the original.