Believe it or not, you missed a few:Number of petsNumber of homes with/without garagesNumber of 1 story homesNumber of renters with childrenNumber of renters with jobs in the governmentNumber of speeding tickets given out at the main intersectionsList of favorite colors and how many of each. 

The tenant just informed me he is planning to quit his job and will be breaking the lease.

Are there really jobs out there as a REI Assistant/Intern?

Tons of renters with good jobs in those plants... 

Kevin and Dave are personable, detail oriented and got the job done to everyone's satisfaction.

Great job for reaching out in the forums here on BP. 

The agent/investors that are doing well is because they treat one of those things as a full time job and the other part compliments it.Lets address each point of your post.1. 

Not a lawyer, but I would think you’d have to prove that they did their job poorly, as opposed to ‘anyone could have missed that’.

If I have 3 applicants that have similar work history, clean backgrounds, and similar credit score, then is it okay to choose an older single person over a younger couple.I should state that the most recent tenant I did a terrible job of choosing and after just a year we threw the carpets out and filled two dumpsters with house and yard trash. 

We do some in house drawings depending on the job at hand.