And no one in their right mind would've expected Galloway to be as good as he's been so far. To expect that would've been like expecting that people could've easily figured out that Mussin Muhammed would finish top 5 at WR last year. No one saw that coming, and rightfully so, he had a career year in his 10th year. Galloway is similarly a vet, who's having a career year.
Secondly, just about everyone here said, that expectations on Clayton should be tempered, as he would be hard pressed to repeat his rookie performance. That's why many people didn't want to take him until they already had a #1 fantasy WR.