I think more of Church than you do. He was a high-performing safety last year, very strong in run support and solid in coverage. Heath is also in his second season coming from a small school, so who knows if he'll be good or the next Lynn Scott. IR is definitely the main concern with Johnson, because we really don't know his talent level or if he'll ever live up to it.
Seeing what you've got is simply a temporary thing that you do when you have players you believe are worth developing before moving on. That being said, I think we're really on the same page. I have no problem with Dallas drafting a safety. I do have a problem with the Cowboys drafting one in the first round because the line is so much greater of a need ... but if a safety is clearly better than other options, then, again, I'd have no problem with that. I'm willing to ride with what we've got, though, if defensive and offensive linemen are available each round who are on the same level or better than the safety options.