The ROI comes from what you didn't have to do.
Notice what's missing from those three modes: anyone losing their job because of a NoviStaf recommendation.
That's not an accident. It's the founding rule of the practice. Every business case we put in front of a client measures its return in avoided cost, not eliminated salaries. Hires you didn't have to make. Turnover you didn't have to absorb. Overtime you didn't have to pay. Customers you didn't have to apologise to.
It's a quieter form of ROI than the layoff-driven kind. It also tends to be more durable, because it doesn't damage the institutional knowledge or the team morale that produced the productivity in the first place. The clients who run this play for two or three years compound the gains in a way the slash-and-burn approach simply can't.