A keiki is a baby plant/plantlet/pup growing off the mother plant (either on an old spike, or somewhere else on the plant, frequently from nodes on the plant)- they develop their own roots, and as such can be separated from the mother when they have sufficient root growth.
Best I can tell from your pix - the small new growth in #4 is a new cane starting - different from a keiki - it's growing along the rhizome, from the base of the older cane..
The brown area may have had water sitting in it, and rotted somewhat. If rot hasn't prgressed, it can continue to grow.
The bump in the last pix could be either a spike or keiki developing
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