What's the NFL record for most interceptions thrown by a starting quarterback on a team that wins a division?
Not sure about an official record, but ...
Tarkenton gave up 21 and 32 in 1971 and '78 - Vikings NFC Central winners
Bradshaw gave up 19, 20, and 25 in 1977, '78, and '79 - Steelers AFC Central winners
Fouts gave up 24, 24, and 17 in 1979, '80, and '81 - Chargers AFC West winners
Marino gave up 21, 17, and 17 in 1985, '84, and '94 - Dolphins AFC East winners
Simms gave up 22 in 1986 - Giants NFC East winners
Esiason gave up 22 in 1990 - Bengals AFC Central winners
Favre gave up 21 and 17 in 2003 and '04 - Packers NFC North winners
Romo gave up 19 in 2007 - Cowboys NFC East winners
Kelly gave up 18 in 1989 and '93 - Bills AFC East winners
Unitas gave 18 in 1970 - Colts AFC East winners
Elway gave up 18 in 1989 - Broncos NFC West winners
Eli gave up 17 in 2005 - Giants NFC East winners
Peyton gave up 17 in 2010 and '15 - Colts AFC South and Broncos AFC West winners
... 23 seasons of more than a pick a game division winning starting QB's.
He'd be in pretty alright company if nothing else.