RE: Pain in chest
If th2150 has damaged his costal cartilage then the worst exercise he could do, apart from dips, would be DB flies as this would put extreme stress on the affected cartilage. Heavy DB presses could turn into a partial fly, if you see what I mean.
I'm no Doctor , but I've had this injury and my experience was to let it heal completely over a 6 months period. During those 6 months I was still able to do BB bench press, BB Inc Press BB Military press and tricep work, so my bench didn't suffer.
8 months on and Im dipping again.