That is where you are wrong. If you load up on juco OL, hoping to get an influx of talent that can play right away, you are taking away scholarships from other positions. You have a finite number of total scholarships and annual scholarships, and a finite number of oline scholarships, whatever that number is that the coach decided is enough. But if half of your OL graduate in one year, you don't have any depth built up. The amount of "processing" is irrelevant, you are still replacing seniors with freshman and have no one in between. Unless you live at the JUCO ranks, and that isn't going to happen.
It's just like having an inventory of parts you only have so much room for OL parts and you know you have to replace your parts every year. You can build the part yourself (freshmen) or buy them already built (juco). With the already built parts, you have to sell them quicker and you don't really know how well they were built. If you sell all of your already built parts, and don't build enough of your own, at some point you are either going to have to build more of your own and get behind on your orders, or you are going to have to continue to buy already built. This company was just sold, no one is expecting a profit for the next couple of years, especially after the first quarter numbers came out. So you go for the slow growth of inventory, and not the quick fix that may or may not help you turn a profit in year 2.