It takes far longer to rebuild a depleted OL than one or two years, especially when starting from scratch.
after the 03 crop of OL departed, the cupboard was essentially bare. all you have to do is look at osu's current 2 deep at OL. There are 3 of 10 spots held by walk-ons, or former walk-ons. that clearly indicates that osu's OL depth is lacking at this point. The '04 recruiting class was a major step in the right direction. The '05 class is super as well.
look at the remainder of the 2 deep, aside from mangold and simms, nobody had any sort of tangible PT coming into this season. Coleman was a converted TE, and Shaffer was a converted DE. Barton is coming off of a redshirt year, and downing has seen 0 time as well.
you cant legitimately claim any of the kids that are just seeing the field for the first time this year busts. simms may be slightly under-achieving, but he is a LT by necessity. He was an interior lineman in hs i do believe, or at least he was recruited as one. Mangold has been the most consistent of the OL crop this year, which isnt saying much. But he is only hurt by having undersized, yet over-achieving kne on one side, and first year starter datish on the other.
in all, it usually take about 2 years to get an OL ready to see the field. That is why it is going to take time to rebuild at osu. it is certainly not something that can be done in one year. depth by numbers doesnt equal quality depth.