Tom didn't give orders under Vito, he passed on orders from Vito. I think the only time he actually gave orders was when Michael was absent in NY and Havana, and Michael explicitly left him in charge.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.