I am a fan of Madara Uchiha, but I dont see why it should be impossible for Sasuke to surpass him. Everyone will agree that Naruto will surpass Hashirama and Madara, so why cant we say that Sasuke can surpass Madara, having heard it from those who know him so well.
In the case of Tobirama, He fought Madara since his childhood and that's for like 20 years+. So Tobirama knows what Madara was like during his time to be able to make that statement "An uchiha that shows the same potential as madara".
Secondly, Orochimaru is someone who has researched for about 30 years+ of his life. Kabuto said that the edo tensei of Madara was created from from the hypothesis of the data Orochimaru collected and Madara is a proof of his hypothesis. Oro researched on Madara and infused him with the rinnegan in his prime body. Kabuto said they made him better than his prime. This means Oro knows so much about Madara and his awakening of the rinnegan to mention that sasuke will surpass him. We know that an uchiha gets more powerful until he dies, there's no need to proof this. Their sharingan gets more powerful as they use it and they can gather as much jutsus as they want in this world. Oro probably knows sasuke's lust for power and sasuke is too young to be at his max. Give him 30+ years to get up to Oros level and with the knowledge about the juubi, chakra and all that crap he has now, not to mention the experience he will gain from this war, he will definitely surpass even EDO MADARA.
Only haters will insist that sasuke wont surpass Madara, but kishi wont make naruto the SO6P and sasuke something of madara's caliber. Sasuke will surpass madara and will attain even more than madara in this life. They need to be on the same level so, Naruto will be as powerful as the sage's first son, and Sasuke as powerful as his first son(who is powerful than edo madara).
In the case of Tobirama, He fought Madara since his childhood and that's for like 20 years+. So Tobirama knows what Madara was like during his time to be able to make that statement "An uchiha that shows the same potential as madara".
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Secondly, Orochimaru is someone who has researched for about 30 years+ of his life. Kabuto said that the edo tensei of Madara was created from from the hypothesis of the data Orochimaru collected and Madara is a proof of his hypothesis. Oro researched on Madara and infused him with the rinnegan in his prime body. Kabuto said they made him better than his prime. This means Oro knows so much about Madara and his awakening of the rinnegan to mention that sasuke will surpass him. We know that an uchiha gets more powerful until he dies, there's no need to proof this. Their sharingan gets more powerful as they use it and they can gather as much jutsus as they want in this world. Oro probably knows sasuke's lust for power and sasuke is too young to be at his max. Give him 30+ years to get up to Oros level and with the knowledge about the juubi, chakra and all that crap he has now, not to mention the experience he will gain from this war, he will definitely surpass even EDO MADARA.
Only haters will insist that sasuke wont surpass Madara, but kishi wont make naruto the SO6P and sasuke something of madara's caliber. Sasuke will surpass madara and will attain even more than madara in this life. They need to be on the same level so, Naruto will be as powerful as the sage's first son, and Sasuke as powerful as his first son(who is powerful than edo madara).