People who are just moving into hc now more than likely aren't as skilled and will do less dps in the same gear. Why else do you think they are only just moving into hc? Yes everyone has issues of recruitment and times and etc. But generally it's because of lower skill, and it's showing on the dps meter.
Not saying their dps isn't enough, just that saying "you are overgeared" is ridiculous when overgearing is subjective to the individuals skill level, and is the reason we have the upgrade system in the first place.