Yeah, the Dorsey criticism was sarcasm. Sarcasm never plays well in print.
There should certainly be some context with the Corbett pick. The 2018 draft looked like a bad draft for offensive line, but a few players have outperformed expectations. The really weird part came from where Corbett was selected since some of the other guys taken later - Ragnow, Braden Smith, Hernandez - were consistently ranked a round higher than Corbett leading up to the draft.
The good news is that Corbett was originally supposed to be a project who would eventually play center. If it is taking longer than expected, Tretter is still playing very well. My current concern is that Kush has looked good in pass protection but hasn't looked like a difference maker opening holes. As the season plays out, it would be great if Drew Forbes makes progress.