I don't know, I have heard the term used many times, sorry it confused you.
just one example I found out of the many times "lead" has been used when speaking of a QB.
Drew Bledsoe went down in Week 2 of the 2001 season, opening the door for a young upstart named Tom Brady. Brady went on to upset the St. Louis Rams, lead a dynasty, and star in an UGGs commercial.
google list