What about the 6th? Pallone's seat seems like it'd be pretty easy to dismantle. I'm not sure what the growth there has been.
There are arguments against destabilizing Lance by doing that, but look at it this way--if you dismantle the 6th, that pulls southern districts up the coast. Adler is from the western extreme of the 3rd district, Cherry Hill, which is hard against the 1st district. It's hard to keep him in a district distinct from the 1st without redrawing a lot more than just the Atlantic coast; you have to give him parts of the 4th and make it more of a Delaware River district. Which is fine, but goes against the make-minimal-disruption-to-incumbents rule that went in the 2002 redistricting.