I think people are reading too much into the balance issue.
People can feel many emotions at one time. Sure, most of the time we've only seen "Fear" or "Will" because that's all the character was feeling (How do you feel Will though? ... Wrong group to ask, I know the jokes that follow)
But at a moment like this, for Kyle? Hope (i think), Love, and Will? Sure that fits. When Superman showed 5 or so different emotions? All made sense.