No 2-celled life exists intermediate between one- and multi-celled

Claim

There are no two-celled life forms intermediate between unicellular and multicellular life, demonstrating that the intermediate stage is not viable.

Brown, W., 1997, In the Beginning: Compelling Evidence for Creation and the Flood: 19. Two-Celled Life? [1]

There are species of amoebae-like protists, collectively known as slime molds, that, when food is scarce, will aggregate together to form a colonial organism that is able to move like a slug, and may be either multi-nucleated or multicellular, differentiate cells, form a stalk with a spore-capsule, and then release dry spores that become more amoebae.
There's no reason to believe that such an intermediate had to exist. The transitional state need not have been a numerical intermediate. More likely it was a functional one in which symbionts came to have stronger degrees of dependence on one another.
Further, the existence of a transitional form at some time in the past does not entail its existence now. A trait that is adaptive at one time may not remain so for all time, as this status is dependent on the environment.
The photosynthetic flagellate Gonium is a colonial intermediate between the free-living Chlamydomonas and the hollow ball-like colonies of Volvox, in that Gonium is a simple cluster of 2 to 32 Chlamydomonas-like cells embedded in a wad of gelatinous polysaccharides.
Dicellular is a special case of multicellular, so this is a distinction without a difference.
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Distinction without a difference (Dicellular is a special case of multicellular)
Suppressed evidence (Unequivocal evidence that there really are 2-celled organisms, ala Gonium, is conveniently ignored)
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