I'm speaking PURELY from the standpoint of an Iowa homer, but one of the best, if not the best, high school cradlers to come out of Iowa was Mack Reiter.
If I recall, he was also a pretty decent cradler at Minnesota too.
I remember seeing this a while ago, and I've found it.
Mack Reiter and the unstoppable craddle - YouTube
UNI Panthers...Because it's just right.