Can't see Lupul being traded, other GMs will probably be worried about his injuries or that he was a one season wonder. But you're not gonna trade a guy that had one of the best scoring rates in the entire league, who had great chemistry with your franchise player, unless there's something good coming back.
Similarly, hard to see Grabo being traded unless it's for an upgrade at center, him being a threat on the 2nd line softens the blow of having Bozak as the 1st line center. Bozak-Connolly/Lombardi/Steckel/Kadri/McClement/etc. would be a terrible 1-2 punch down the middle.
On HF they might be worth a good return. But it the real world I would wager against it. GM's are way smarter then all of us, they can probaly check history and see Lupul was a one seaosn wonder, so why give up alot when his value is at its highest. Grabo would be worth the most of the two tho