I did say 'silent' mandate. The talk in the paddock reg Domenicalli being hired as TP in the first place was due to his nationality. Even when Todt was team boss, the rumours going around were about an "Italian TP" being a prerequisite, way before Domenicalli's name was mentioned. Are you saying you missed all this?
I'm not looking for any articles or websites stating this, it's very old news and even if I find it you'll counter with 'it's just an opinion/a rumour/etc" you can't find concrete proof of mandates which aren't black and white.
Then again, I'm not here to convince you....I'm 100% sure of how and why Domenicalli was hired, and it certainly wasn't because of his track record...which was nil. While Brawn was a key architect in their straight 5 year success. Also a telling sign is the 'falling out' of Brawn and Ferrari just before the Domenicalli announcement. But maybe Brawn was just pissed because they were not willing to change the flavouring of their pasta. Who cares, I for one was glad Brawn didn't get the post since it meant less success for Ferrari. 
To satisfy my own curiousity, I did search for articles/websites that mentioned this "silent" mandate of which you speak,
only to come up empty. Rumours are oftentimes just that: empty of truth.
Secondly, I looked into Domenicali's history with Ferrari and it turns out that before he was
Team Principal, he was the
Team Manager, Sporting Director, he also worked in administration, human resources, and he oversaw sponsors, which
would suggest that he had an extensive knowledge of the workings/philosophy of Ferrari, thus it was a "natural" next
step for him to become Team Principal. That is, he worked his way up. Nothing wrong with that, as it happens in the
"real" world, all the time that people with little or no expertise/experience in on field are successful because of the
previous experience they have within the same organization.
Scumi moved on. Todt moved on. Brawn moved on. Schumi eventually came back. Todt became president of the FIA.
Brawn started up his own team. What's the problem with believing it was little more than a natural progression?