Duke has quite a head start though, given he's already gotten past most of the team's defences, and has a good handle on how each of them think/avoid unwanted topics. I think one of the others might be the official team therapist, should there be one, but they'll have to lean on Duke pretty hard most likely. Whether they know/realise this or not.
There have been a couple of Duke P.O.V. bits that make me think that Duke either doesn't have the ability, or doesn't think he has, to be much more than a den mother. Although he does make a good one.
Doesn't mean he won't try, though, if he thinks it's needed and no-one else is stepping up to the plate. But he might not be obvious about it. This is Duke, after all, who excels at the art of the sneaky.
