All players have a “type”. Some types are good scorers in all sets, some are good scorers in certain sets, and some are specialists who are never likely to be efficient scorers, regardless of set. Johnathan Foreman, for example, has offensive deficiencies that would hurt a lot in triangle and flex. In FB, his athleticism and free throw shooting make him an efficient-enough scorer, despite average ball-handling and very sub-par shooting. I would utilize this kind of guy similarly in motion, since I think that works closer to FB than the others, but in flex or triangle, he is a defensive specialist, and I would restrict his exposure to the ball.
https://www.whatifsports.com/hd/PlayerProfile/Ratings.aspx?tid=0&pid=3665169
The questions for me in game planning are 1) what does this player do really well? 2) what deficiencies does this player have? and 3) does the set I play maximize his proficiencies and minimize his deficiencies? If the answer to the last question is yes, I treat him as a scorer in game-planning and distribution.