Select the Marketo onlylead
person (Microsoft Type is empty) that you want to create as a contact in Dynamics.
Person Actions and Microsoft, and select SyncLead
Person to Microsoft.
Click Sync As and select Contact. Click Run Now.
The new contact is created in Dynamics. This contact will not be associated to any Account in Dynamics.
Now, you can select Contact when you use the Sync As constraint in a smart campaign filter.
That's all there is to it!