I would think so. Because the delay in speed is the movement of the heads. So in your example, drive A (the slower one) can only move x amount of data in a given amount of time. The fragmentation causes a more or less constant (for a given fragmentation scenario) time for head movement. So drive B, which has a higher transfer rate due to the higher RPM, can move more data in a given amount of time. Therefore, if you take away the fragmentation, it will have a greater benefit from not being fragmented.
Sorry for the rambling answer. Wasn't sure how to express what I was thinking. LOL.
No problem. Your explanation makes sense to me.
T
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