He wishes he could do something for the boy, but expects if there was something to be done, Dan would have by now.

"There are others?" he asks. "Ones that aren't good."

It isn't quite a question. The way Dan says it makes it pretty clear there are and while Obi-Wan can't sense them the way he knows Dan can or see them the way Klaus can, there's still a sense of shifting within the Force.