It's interesting to draw some parallels between Iowa's current situation and the British army during the American revolution. When the fighting in the colonies started, the British army was lacking in manpower. The primary reason was that the British soldiers were not treated well by their commanding officers so it there were problems convincing young men to enlist. So when the American colonists revolted, the Brits were forced to hire mercenaries (primarily Germans) to shore up their depleted army.
It seems that something similar is happening to the Hawk program. HS wrestlers are watching good recruits go to Iowa and end up being injured or burning out early. Plus it appears that some guys who chose Iowa have opted to bail out after being there a while. As a result, the supply of 1st tier recruits for Iowa is drying up. Consequently, Iowa has been forced to go to the portal for replacements, just as the British had to do. Of course, we all know how things worked out for England back in 1776.