Just spit balling an idea here: When you say SFDC Leads Only - do you mean that the lead should never make it's way to Marketo (basically, an unmarketable lead)? I ask b/c if you have a set group of emails that you know shouldn't sync, then you could create a smart campaign that listens for a new person to be created AND has the email address of a person you don't want to sync (this would require you to set up a smart list of the emails you don't want in the system), and then have the flow step delete that person (I believe this will beat the sync time to SFDC, but you'd need to test it for sure) BUT it does mean you would be deleting that person from Marketo as well. You could also use a similar method of performing a what/if flow criteria on any new person created, same idea - if the new person created has an email address that "does not" match anyone on your "no list", then sync using __whatever rule you have__ (could be auto assignment, depends on your business); additionally, remove the default choice so it says "do nothing" when a person does match to your "no list". That should make it so that only people not on your "no list" should be syncing to SFDC. Again, just spit balling, I haven't tested these methods but I often have to create workarounds for similar issues, so I hope these ideas prove helpful to you.
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