GSS wrote   it would be ridiculous for me to try and teach carthys guitar style on my concertina, do you get my point.

Maybe so, but that doesn't mean that the style of one instrument can't influence the playing of another. I recorded Lizzie Higgins singing some songs which were very definitely influenced stylistically by the piping of her father. Chris Coe's hammer dulcimer playing affects the style of my fiddling and she in turn took stylistic influences from fiddler Willy Taylor.

Surely, nobody in a living tradition (if we consider that to be what we're playing) wants to emulate just one player. Most teaching of instrumental playing is about learning to play the instrument to a standard. The following stage is to use the next few decades to learn to play it properly using all the stylistic tools in one's toolkit.