One reviewed clear ran six level-70 Mythic and Secret units with two economy slots and cleared in roughly eleven minutes of game time. A second reviewed clear was published as a no-Immortal run and repeated the same shield, fragment and Clash sequence with a different lineup.
A third reviewed clear is the closest thing to a low-investment answer. Its six slots held one Limited unit (Yoto (Calamity)), four Mythic units and an Epic income unit — Leo — with Bluma (Data Analyst) still at level 64 rather than capped. No 0.1% drop and no Secret unit appeared in the run, and it cleared 45 waves in about ten and a half minutes with 7.53M total damage on the result panel.
What that third run supports: the mode is clearable without a top-end roster, and the roles it leaned on are the roles the other clears used — two income units, elevated coverage for the flying waves, and concentrated ground damage for the Vulnerable window. What it does not support: it still carried one Limited unit and near-capped levels, and nothing in it proves that a specific substitute performs the same.
What that pair supports: the loop is stable and the mode is not gated behind one specific trait. What it does not support: the second run's loadout panel never showed traits or stat rolls, so treating either video as proof that any lineup clears is going further than the evidence.