Comment by rebeccaskinner

At best it may indicate that there's something worth looking into, but it doesn't tell you much about the actual productivity of the engineers. One engineer may be producing low quality output that requires a lot of re-work later, or they might be gaming the system by over-estimating work, or picking up lower priority work that was accidentally over-estimated in order to improve their numbers. They may be a domain expert in a particular system while the other developer is getting up to speed. One developer may be spending significantly more time mentoring or helping their team work better. They might be writing design documents or spending more time with customers. They might have been around longer and are regularly getting pulled into supporting things they worked on years ago, or getting asked for help from other teams who need their expertise.