That depends on why it fell apart, and what he would have done about it. Here is one possibility. The developer checked on the lead system every day, which mo

That depends on why it fell apart, and what he would have done about it. Here is one possibility. The developer checked on the lead system every day, which mostly ran itself. After the developer left, they checked a few times and then stopped looking at the lead system's reports because it was always good. Then months later another team replaced a key system that the lead system needed. Nobody noticed until sales reports sucked. By the time they fond and fixed it, they lost $X million and the people who got fired got fired for not having followed the recommendation to keep the system monitored. I've seen variations of that story before. And I've seen companies get hurt because of it. Now there might be blame for the developer. But there are enough ways that the developer wouldn't deserve blame that I wouldn't assume the worst.