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You can think of A and B as functional expressions of physiological capabilities other than those provided by sustainable aerobic metabolism, and as such they are not functions of FTP but are sufficiently independent of FTP. Unless you think, for example, that the physiological factors underpinning one's peak/sprint power over a few seconds and those underpinning FTP are somehow related.
I look at A and B as internal metabolic processes. And they cause FTP which is an external measure of body movement. So I look at the MMP curve (an external measure of body movement) as a result of metabolic processes and several environmental factors including the actual movement of the body.
I will name the main metabolic processes: aerobic metabolism, glycolytic metabolism and creatine phosphate metabolism. So MMP = f ( aerobic metabolism, glycolytic metabolism and creatine phosphate metabolism plus environmental factors.)
At most points on the curve the creatine phosphate system has little effect but at all the rest of the points the other two metabolic systems are operating and very influential as well as the environmental factors.
FTP and these metabolic processes which are producing the energy are not independent. FTP is very dependent on these processes.
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Jerry Cosgrove
Sports Resource Group
http://www.lactate.com
https://twitter.com/@LactatedotCom