I don't see how thins points to anything bad for Apple. Someone wanted to retire; his former employees didn't feel the replacement was ready, so they talked to management about it. Management decided to make an offer the retiring person to keep him on board for a while until a transition was worked out. This isn't something that's unique to Apple...though the amount of cash involved likely is.
There's a lot of times in the corporate world where someone decides to leave, is offered a substantial pay increase and decides to stay. I think in this case it was less about keeping Mansfield and more about keeping the people that had been working under him. To keep those employees, they needed to keep Mansfield around for a while. What's the big deal?