Here are Lee's vs Jefferson's passing stats through 6 games

Lee has thrown a pass in only 4 games. In 2 of those games, he only threw 1 pass for the game. So far for the season:

27 for 36 = 75% completion rate
2 tds to 1 int

Jefferson's passing stats thus far:

53 for 101 = 52% completion rate
2 tds to 7 ints
0 tds to 6 ints in the last 5 games

Of course, this doesn't compensate for JJ's running compared to JL's lack thereof, but it's easy to see by the numbers (as well as watching the games) who needs to be our primary captain on offense.