Were you thinking they should be linked using the Similar Observation Set observation field, @Thunderhead ?
That is such a cool way to link Observations together, with many uses, as discussed in that thread.
@Pande I just started a new Similar Observation Set (caterpillar with construct, one I had never seen) yesterday, but here is a “complete” Similar Observation Set" I made.
(Honestly, I ought to use that tool more.)