Obito's was transplanted so he can't use Sharingan techs.
Madara sharingan also transplanted... the real ones already blind.. then the rinnegan was given to Nagato.. so its not a big deal to have a transplanted sharingan.. and to gain Internal MS.. one should has other sharingan eyes.. like sasuke gets Itachi eyes.. so the receiver is able to use the Sharingan techs.. so its wrong to say obito's eyes was transplanted so he cant use sharingan techs... by transplanting the eyes.. the ones receive it can be level up his powers...
He used Sharingan for that, a 3-Tomoe.
He doesn't have Susanoo...he doesn't even have 2 Sharingan.
yes that right he doesn't have two sharingan.. but he has more than 2... he has dozenz of sharingans ... u can see this in the chapter that danzou die.. when tobi frustrated that he cannot get the danzo eye.. in front of him has many jug filled with sharingans ..
but, u can look closely during the konan battle.. the mask was broken and its reveals his second sharingans... so that proof u wrong that obito doesnt have two sharingans eyes... if he really desperate to have the eye( given to kakashi) i think, he must have done it long time before... but, he didnt, why? because it was not necessary... he have a lot of its... why bother that eyes when he have others in his possessions....
Again he doesn't have Susanoo.
he have susanoo ... but he didnt need it yet!!!... the reasons uchiha use susano is because susanoo is the best sheild , to protect from any attacks.. by using susanoo , uchiha will be unbeatable... as for obito, susanoo is not a need because his opponent are barely touch him or attacks hims... so he didnt need susano to protect himself , right?? as long as he can avoid the attacks, he be fine....
and he maybe has the Harashima cells.. so he can heals himself quickly.. thats why the naruto rasengan didnt hurt much .. just a torn shirt and a broken mask... if he was pushed to his limits, maybe in the verge of death, then he will use it.. so for now, obito didnt show yet all of his powers and technique.. and do not forget , he is Madara disciples... so he still have something under his sleeve...
ands once agains, he most likely try to save chakra.. using a susanoo dealt with great risk.. to much chakra consumes.. he is fighting against the strongest shinobi... so he needs to fights carefully...
JUST SEE!!!... waits for the time to come... Obito's Susanoo will be revealed.... (just like tobi = Obito.. is not logic but its the facts)
Dont See doesnt means its not exist.. just the time will show it...