The Sloan Great Wall spans roughly 1.37 Gly of connected superclusters (Gott 2005; Park 2012), beyond the few-hundred-megaparsec ceiling hierarchical clustering can coherently assemble in the age of the universe and crowding the homogeneity scale the cosmological principle requires. The percolation defense must be re-invoked for every new giant the surveys add.
Bottom-up growth at Gaussian-fixed rates caps coherent structure at a few hundred megaparsecs, and the cosmological principle requires featurelessness beyond the homogeneity scale. A 1.37 Gly wall violates the first and crowds the second, leaving only the argument that big surveys percolate unrelated overdensities into apparent giants, one independent stroke of luck per structure.
SCT reads the Sloan Great Wall as one rung of a size spectrum the cascade builds by construction. Near-head-on collisions deposit wall-like structures coherently and instantaneously, the intersection front engulfing the overlap volume before any internal signal crosses it (P22, P33), so no growth rate constrains the result; the wall's extent records the scale of the cascade stage that deposited it (P36, P37). The Sloan Wall sits between the CfA2 Wall below it and the Hercules-Corona Borealis Wall above it because the multi-stage cascade deposits structures at successively nested scales, the whole family capping at the first-stage limit Λ_max ≈ 2 × R_pocket ≈ 5 Gpc (P55).
What ΛCDM must explain as a stack of independent percolation accidents, SCT explains as one mechanism's size spectrum: walls, rings, and arcs are the shock-compressed shell morphology of collision deposition read at different stages, the same family that carries the Big Ring and Giant Arc (recid 85) and the CfA2 Wall (recid 94). The cosmological principle survives intact in SCT's formulation, applying to the infinite-space average rather than to individual patches, so a patch crowded with deposited giants violates nothing. The deposition physics is in Paper 1, From Chaos to Convergent Foundations, with the cascade structure-seeding in Paper 4, From Chaos To Collisothermal Cosmogenesis.
Keystone economy: P22 supplies the coherence, P33 the geometry, P36 and P37 the ladder, P55 the cap. One mechanism, one spectrum, no luck required.
DESI and Euclid giant-structure censuses carry the kill: if the wall population dissolves under deeper sampling into percolation artifacts, with coherent structure genuinely terminating at the hierarchical ceiling, the cascade ladder is refuted. The cap cuts the other way too: confirmed coherent structures substantially beyond Λ_max ≈ 5 Gpc would break the parent-pocket hierarchy that sets the first-stage scale.