They are replacing 3 of the five members of the line, including two in the first two rounds of the NFL draft. It may be that it's expected of Hiestand now to just plug and play at the same level. Hopefully they will, but let's see how the line meshes before calling them the best in the nation.
That article seems to have been the same article I read last season with just the dates changed and a bit of updating of the names.
As a side, nice selection of video. That video is a bit eerie in that it is of the play that ended Folson's season. The OL did dominate on that play though.