"Are you to blame for the failure of your partners to cross-sell you to their client contacts? Not necessarily, but you could be part of the problem. Clients select lawyers they know, like and trust. Referral sources, including your partners, send you clients for the same reason. Since they know, like and trust you, they transfer those qualities by recommending you."
The good news is that even if you are a part of the problem, Kane points you at the solution. Read the post. Then get working on solving it. You - and your partners - will be glad you did.