EIGRP clarification and good resource

Minary

How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP? - Cisco

This page cleared up a few spots for me.

My mistake was that the EIGRP Feasible successor rule (AD < Successor FD)

whereas the variance command allows you to use a route that is AD <= variance x FD)

(the route has already passed the Feasible successor rule)