The origin of the Grand Canyon is still being debated by uniformitarian and creation scientists. Two uniformitarian scientists have recently used pieces of previous research to suggest that the Grand Canyon was finally formed when the Kaibab Plateau was breached by water piping through limestone—a difficult task with little or no evidence. Several creation and uniformitarian scientists have recently defended the dam-breach hypothesis against published objections. These are reviewed, and another flaw is introduced: the absence of a huge cobble and boulder delta at the mouth of Grand Canyon. The Bidahochi Formation is interpreted as containing Lake Hopi bottom sediments, but most of its deposits are currently higher than its proposed elevation. Furthermore, the lacustrine interpretation is equivocal. Problems with the breach event are discussed. The late-Flood runoff erosion model still seems the best explanation.