That isn't how I read it. From what I understood, the senior people were upset because they weren't making as much more than they used to. For example, the web designer got a $9000 raise -- yet that wasn't enough because some others "got more."
It sounds to me that all of them got at least the raise the would have normally received. I believe they even received a bit more than they normally would have, but were upset because they didn't get as much of a raise (since they were already near or over $70,000) than some got to bring them up to $70,000. They looked at it from how much less they were getting in comparison to others in the company, rather than comparing how much they were getting to what people with similar experience were getting at similar companies. I suspect many (or most) of those that quit are struggling to get more money, or even equal money, at another company.
As for the web designer, it seems fairly obvious that he is a part time worker. For example, the fact that, after the raise, he still only made $50,000 -- when there is a $70,000 minimum -- largely proves he was not a full time worker. I'm guessing that, if he worked full time, the web designer would be making a minimum of $100,000.