According to this wiki
"The opposite of the bigger fool theory is value investing"
Even though I call my blog "bigger fool trading", I almost always take the "value investing fundamental analysis" approach.
Momentum day trading and long term value investing are just two sides of the coin. They don't have any conflicts in my system.
Insight of causality derived from due diligence is the magic glue that sticks both sides together, and makes both methods viable through a unified methodology.