Tim, I think you may be confusing new growths and keikies.
Dendrobiums are sympodial plants, meaning that the "colony" grows by extending a rhizome from the base of an existing growth and then shooting up a new growth from it. You can see that in your plant, with the three really old growths, and the last one, still with leaves, remaining. If that was a really mature plant, with lots of green canes, it is possible to separate them into clumps of at least two old, green canes and a new growth. Your plant is nowhere near ready for that.
A keiki ("KAY-Kee" - Hawaiian for "baby") is an adventitious growth up on the cane itself. When they have leaves and about 3" or 4" of total root length, they may be separated from the "mother" plant and potted up individually. Plants with some species in their background do so more than others, but in truth, they primarily grow on plants that are not getting the proper culture, and it is a survival reaction for the plant, not something one should try to do.
Judging by the relative size and appearance of that most recent growth, I'd say you're treating it well.
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