Being a Leader doesn't help if the profile is not Open :( Can't be adopted.
What you need to do is go to the Family Tree and Tools tab; scroll down until you see the Open Profile Request Form. Send that in with reason for believing the profile should not be Public or Private, e.g., give the actual date of birth, which should be over 200 years ago. Usually within a couple of days the profile will be Open and you can at least put in the correct dates.
Edit: Thought I'd better clarify my answer a bit. A Leader can, if necessary, adopt any Open profile. It takes a sysop to adopt a Public or Private one. What you can do is submit the Open Profile Request and wait for the 30 day default approval for a merge. You can also submit an Unresponsive Profile Manager request form if you have tried to contact the manager and gotten no response. After about a week, the profiles can be opened and orphaned for adoption.