Well, that could be it because I think she still treats Linds like a little girl too sometimes.
I just thought of something else... Maybe they could do one episode where it's the anniversary (for lack of a better word) of that whole lab explosion incident and Cath feels guilty all over again and then approaches Greg first with the assignments, handing them all to him and saying, "here, pick one". That would be interesting (and show continuity) and then maybe later that causes her to realize that she's been stunting him job-wise by constantly giving him the crap jobs and she decides to promote him some way to let him know that he is appreciated.