thts not true if madara didnt have susanoo then he wldnt of known about it but somehow he doeshe doesnt that we know of,
everyone gets different ms/ems abilities
ms- own unique abilities
ems- u and ur brother's abilities (i think)
itachi and sasuke have it because
itachi- his own unique ability
sasuke- itachi gave him his ms ability but sasuke's is a bit different (bow and arrow)
sooo madara, izuna and shisui dont have sasanoo that we know of