That said, it is how spiraling (which isn't CCSS specific) affects gifted kids that I struggle with, because my kids want to keep going to master it deeper, not stop and pick it up next year. So they might truly get it right away, beyond the instruction level, and then feel like they aren't learning anything new 1-2 years later when circling back. Whole to part, vs step by step.
My understanding is that CCSS Math doesn't spiral unlike the math program they were using previously. At least for my state. It used to be that 4th & 5th grade math were nearly identical, just 5th grade math went deeper. Making it easy for the 'gifted' or high performing math students to skip 4th grade math. While with Common Core they need to implement "compression" instead.
That said.. since Common Core is a set of STANDARDS. Not all states/school districts teach it the same way.