I can't speak for the others but here's my view. The coaching staff builds there board (keep in mind the board at ND looks a lot different than at other schools). Send out offers, gather interest levels, go visit prospects, have prospects come to campus, etc. As that process unfolds we get some kids to committ and other kids commit elsewhere or fall off the board all together. Some kids just don't want to be at ND, that's not the staff's fault. As all this occurs we move further and further down the board sending out new offers to new prospects that fill what we are looking for. We also need to keep in mind that not all kids have great junior years, some kids are late bloomers and we see something now that we didn't see before so we start the process with them a little later than others. With the end goal filling up the available spots with the best possible fit and talent at each position. Its not an exact science and IMO this staff does a very good job for the most part.