They didn't "waste" any 1st team reps. The coaches wanted to see how he would hold up against some starters and obviously he didn't impress the coaches at all.
They were running 7 on 7 drills without pads, how much could they really learn?
Remember in camp last year we were all being told our best DT was a guy we wound up cutting early in the season because he jumped offsides so much?
One thing that became clear was that as Wolfley kept saying on air "he's a guesser, he guesses the snap counts." Apparently in training camp that's a very easy way to look good since it's apparently easier to know the snap count, get off quickly, and make a ton of plays.
That player, Langston Moore, wound up playing 2 games, got cut with 2 tackles and wound up missing most of the year before Detroit picked him up.
I made the mistake last year of being angry that he was cut because he had reportedly played so well in camp and OTA's that I bought into the idea that he should have been kept. I'm not buying into it this year because the same guy, Clancy, was behind Moore in camp last year and when the games started Moore couldn't cut it.
There's a reason they have camp and preseason I would have liked to see us at least give the guys a longer look, but we couldn't because of the caproom snafu.