LA Chargers: Ranking potential free-agent QB options for team

The 2020 season is looming over the Los Angeles Chargers, with a feeling of uncertainty in the air. As the year progresses the question mark at quarterback has never been bigger, especially with the departure of Philip Rivers.
It has led to a lot of speculation as to what the Chargers will do by the time the preseason hits.
With the feeling being especially more prominent that a quarterback will be selected with the No. 6 selection, it’s also extremely likely that they obtain a veteran quarterback for them to learn and develop behind.
On this list, I will be grading the potential fit, the likeliness of the signing and a potential contract that they would be likely to take. I would like to say that all of the following choices are based upon my opinion, and I have no ties to the organization, therefore if you have any sort of disagreement feel free to comment with your own opinion.
Also not included on this list is a quarterback currently signed to or on the Chargers roster. (Excluding Tyrod Taylor and Easton Stick.)
Grading Scale
The likeliness is graded on a 1-10 scale of 1 being least likely to sign/start; or happen and 10 being the most for it to occur.
The Potential fit will be graded on a letter grade scale using the team’s assets already there, not speculating on potential free agent signings or draft choices.
(All contract and cap assumptions are based on Spotrac)