the big bambino
Cricketer Of The Year
From perhaps faulty memory, Johnston like Voce, started out as a spin bowler before discovering they were even better at pace. Same with Tate. The two left armers occasionally reverted to spin in their test careers, though I think by the time of bodyline Voce gave up spin for good.He'd hardly be the first, or last bowler to switch between tools in the box according to conditions.
Big Bill Johnston could bowl both pace and spin. I've seen some footage of both styles of his. Thing is, his normal fast bowling run was rather short, bounding and whippy as is, so going to left arm spin was maybe only a half speed different in approach.
Point is bowlers didn't have to be as specialized in those days, so there was more scope for them to use more flexible approaches. Getting a little less joy and purchase on an uncovered pitch with the sprint and sling approach that now characterizes the modern pacer, probably also contributed to that tendency.
For Barnes, I don't think he really ever saw the need to "choose a style" to make use of different techniques.
Barnes seemed to reserve slow bowling for league matches - though this is just inferred from what I’ve read. It makes sense as he valued his bowling as his livelihood and explains why he frequently avoided fc cricket for the leagues. After all he got paid as much for much less effort. A real mercenary, he realised what would be required for tests and demanded compensation and his terms were not always met. In that professional regard for his services he was as trailblazing as influential cricketers like Grace.