No, a lot of those players played more years at their second school than they did at UND.
Example...Blaisdell two years at UND, three years at UNH. Tychonick two years at UND, three years at UNO. Etc.
Also, the vast majority played their underclassmen years at UND, then transferred out to different schools for their upperclassmen years. I think we've all seen how much better NCAA players get (typically) for their JR/SR/GR seasons when compared to their FR/SO years. Just look at Caggiula.