It's probably good practice to get the source code and assets from the partner in any case. You may choose to sign and deploy it yourself, or if you delegate that to the partner and they get the banhammer, you can republish under your own account.
Republish a banned app without modification under your account is the fastest way to get yourself banned -- it kind of make sense when you consider how spam app works.
Once your app is flagged as spam/scam, the only way to recover is get a human review from Google.
