Thank-you for your support.You guys get all bent out of shape on what word a guy uses and spend 5x more effort arguing that than trying to help him. He gave what he meant in the context of his question well enough for me to understand it, so I know you guys who are more accomplished should be able to figure it out. It's amusing to me but if I was trying to get an answer instead of a grammar lesson I might be frustrated.
Thank-you also for your support.Though the English definitions of sharp and keen may make them synonyms, it is quite common in technical fields to narrowly define a term to precisely convey an idea. As has been pointed out, this can cause confusion if the reader is not familiar with the technical definition but that doesn't mean it's wrong or not useful.
You are correct as to the effect of a strop; however, it is the compressibility, not the sag that is responsible. Otherwise, paddle strops would not function.I am tracking with what you are describing, but I don't think keen and sharp are differentiated enough for use in this manner. It also leaves a big gap for those that use no secondary bevel. A good argument could be made that all of us that use a hanging strop create at least a tiny amount of convexity to our edge, but what about the paddle strop guys.
If you want to make up new words to describe the two characteristics I call keen and sharp, have at it.