A 2nd is probably pretty fair value for Bean.
He's 23 years old, 5 years post draft and has developed fairly well to this point, but not a slam dunk by any means. Played a very sheltered bottom pairing role in Carolina with some PP time and struggled at times on the defensive end of things, but also showed some flashes. He's likely not a finished product though, but with Slavin and Skjei holding down the LHD side for the foreseeable future, he's not got a great path in Carolina.
Brind'Amour never really was confident enough in him to give him a bigger role, but there wasn't a bigger role to be had.
I can see a team wanting to give up a 2nd for him, but probably not give up a 1st.