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That is a hypothetical used to promote a narrative, all the test & observations presented show all mutations must be present for specialization. The Monarch only feeds on milkweed, but somehow it survived the A119s phase feeding on milkweed plant (CG-containing plant)without the needed 111& 122 mutation?

In an hypothetical adaptive walk. A119S does NOT provide sufficient CG-insensitivity so an insect with just A119S will die specializing in CG. The are other mutations needed for survival.

Moreover u left out: “A119S is a common substitution among taxa that do not specialize on CG-containing hostplants“

Natural selection is undefeated. Therefore the need for immediate substitutions to sites 111 & 122 in order to specialize on “CG-containing hostplants“

An adaptive walk has to show adaptation in the environment. If all the mutations occur outside the natural environment, without natural selection, it is not an adaptive walk.