My guess is that if DJ Moore's numbers dip at all this year, he will claim victory while ignoring that the offense now has 3 WR1 to spread the targets around. Although honestly, I think and hope that DJ Moore has very similar production this year that he had last year.
I think he loses twice. Moore would have been good enough to remove any excuse for Fields. Moore had a good year. If Moore regressed with Williams then that argument can't hold.
Problem is Moore had reasonable numbers in Carolina regardless of the QB throwing it, so chances are slim that Moore will be worse off with a better QB.
The only way Moore has less production would be because Williams is distributing ball all over the place in Waldron's offense, which is a more likely scenario.
So there's literally no way for the rainbow to be correct.