However, from Lead Activity log, even based on the screenshot from my previous message. It looks like SFDC synced "lead owner" value. However, in SFDC, under the same lead record. It shows that Marketo Sync changed "Lead Owner" value (please see screenshot below). I believe our SFDC team will through this back to me and ask me why...
Any Assignment rule and Workflow in SFDC will run under the "marketo sync" user name and appear as such in SFDC. So this does not mean the values were pushed from Marketo, only that the changes were executed form the Sync user.
-Greg