If the property is nearby, I would have gone there myself to A. get the measurements and determine what color to replace with.

The home has been occupied by tenants for the last several years.I would plan to have the underside of the roof painted in the attic to cover up the black coloring.

No, of course not - many red regions will outperform blue ones over the long-term.

The entire system is designed to just be this 1 thing, color int he lines, don't venture out, just follow these steps. 

People click instinctively when they see vivid colors, great decor and great staging, highlighting the experience they will have in the home.

What is your go-to paint color and brand?

I'm considering upping my aggressiveness on remediating this issue with something that will cover up the color of the mold so it will indicate better remediation efforts to future potential buyers. 

That said, an easy way to think about what a disqualified party can do/not do is this:  You can do white collar work, not blue collar work.  

It seems like it is something of a gray area, because you are taking care of it, but you might lose this one in court.There is also this,"If an apartment becomes uninhabitable due to fire or other damage not caused by the tenant, and the lease does not expressly provide otherwise, the tenant may vacate the apartment and cancel the lease.

Rent-by-the-room tenants are more so catered toward working-class/blue-collar or young professionals looking for cheap rent.