I'm glad that you had a "generally" positive resolution.

I had a similar circumstance 2 years ago.

I was in a middle seat in the final row. One of the last passengers to board was an obvious COS. He took the aisle seat next to me, couldn't lower the arm rest or fasten the seatbelt (he asked for an extender and was given one). He was, for all intents and purposes, sitting on my right thigh for the entire flight. Before we left the gate, I tried to subtly alert the FA, but she actually poo-pooed me, smiled, and walked away.

In the ladies room at my destination, I found a painful, bright red hot spot the size of a small frying pan on my thigh. Had the flight been any longer, I think this could have become quite serious.

I e-mailed CS at SW and got (what I perceived as) a very sincere apology and a free flight.

It's sad that in both cases, the "victim"--the person forced to share their space unwillingly--was put in a position to have to either suffer silently OR become ugly in front of, and embarrass, the COS.

I don't fully agree with the woman currently suing SW over the COS issue, but I agree with her premise that it's about time SW developed a reasonable, consistent means of dealing with COS well in advance of boarding.