Why is Flacco in the clear?
There are several reasons. The main one being his Super Bowl ring and the historic form he was in whilst attaining it. As Albert Breer said on The MMQB Podcast with Albert Breer on the 28th July 2017, Flacco may have benefited from a Super Bowl victory more than any other player ever has. Honestly, it’s not too hard to see why he has benefited. In his four playoff games he threw for 1140 yards with 11 touchdowns and no interceptions and did basically carry the team through Denver and New England and then past the 49ers in the Super Bowl. That carries a lot of weight.
In addition to that, he has consistently produced in crucial games. Obviously he hasn’t won all of them but he tends to be a productive in the playoffs or in big games against good teams.
He also, strangely, benefited from his injury shortened 2015 season. In the 6 games he missed the Ravens got to experience what it is like to be a quarterback needy team in the current market. Uncertainty, poor production and high turnover at the position whilst searching for someone who can at least get by. With Flacco under center the Ravens are a much better team than they would be with any of the other current quarterbacks options, even considering how he stacks up against aforementioned passers.