FNG
but I responded that informing the aircraft ahead that I could see them might give them one thing fewer to worry
As he said - unnecessary verbiage
You're behind them - therefore you're not a worry to them - it's them that are a worry to you
In addition how do you know there were two - there might have been only one and the the other was departing downwind low level. Or there might have been three and you couldn't see the third (or the first, or the second). There can sometimes be a fine line between a 'helpful' call and misinformation.
EVO
traffic called overhead just before we joined overhead.
I'm intrigued. Is an over head call standard practice at 'HR or is the normal call 'deadside descending'. Reason I ask is if you call in the overhead just after someone else then you've no real idea who's going to be descending first. However, if you hear 'deadside descending' before you then that's an indication in itself that you're going to be no.2 to that traffic.