Yes, we've all worked with people like that. They are easy to identify, regardless of what kind of metrics they throw out. All you have to do is use your subjective powers of observation, and have the courage to believe this instead of trying to justify it through metrics. If you are not able to do this then no amount of process or fake metrics is going to save your development team.

In particular, if you are measuring the number of hours people work as a way to measure productivity, then you are in deep, deep, deep shit.