Interesting idea. The Blazers have 2 lottery bound picks, as well. If they offer those two picks (albeit, the pick they got from NJ is top 3 protected) for Rondo and nothing else, I would do it. That'll give the Celtics 4 1st rounders and could gamble on those 2 non-lottery picks.
Hypothetically speaking, the Blazers get the 4th overall pick from the NJ trade and Portland's own between 9 and 12, that will possibly allow the Celtics to get Thomas Robinson, Andre Drummond, Terrence Jones or Harrison Barnes. And with their own two picks, they could get either Zellers, either Lambs or their future point guard, Kendall Marshall.
Interesting, indeed.