Compare with their ages......
sasuke at that age had 3 tomoed sharingan, dozen of fire jutsu and lightning jutsu, and too fast for obito, obito is totally defeated.
itachi, no quesion about it, he was anbu captain and mastered MS at that age, will end obito in few seconds.
Shisui, well they say that his doijutsu powers are praised by all uchiha members, and was nearly same level as itachi, no problem in defeating obito.
Obito, he was literally a crybaby, when he will see his enemy, first he will cry and then piss his pants, then may go with his 1 tomoed sharingan, and slow reflexes, and some fire jutsus.
And just leave madara and izuna, they are his worst nightmare.