Wonder if mine is worth overseeding considering there isn't much soil. Though...seed is relatively cheap. Probably worth a shot.
I also have a lot more bulbs coming up than I thought I would. Guess Cisco didn't kill as many as I thought he did...though they aren't coming up in nice orderly rows anymore. :-\
I think yours seems pretty full but it wouldn't hurt to fill in bar patches... ours gets very worn down all winter. The whole thing is a bare patch.