The correct answer to the Flip to Cradle quiz is the skill is Illegal in Level 6. Toe (and leg) pitch flips are specifically banned in a clarification to Stunts D, stating “Toe pitch, leg pitch and similar types of tosses are not allowed in initiating free flipping skills.” The USASF definition of Toe/Leg Pitch is:
A single or multi-based stunt in which the base(s) toss upward traditionally using a single foot or leg of the top person to increase the top person’s height.
The explanation is based on the 2016-17 version of the rules dated August 31, 2016.
This answer remains accurate through the 2017-18 rules dated January 26, 2017.