What, Boruto obviously surpassed Part 1 Sasuke. All of the other characters needed Sharingan to use Chidori but considering how Boruto doesn't need it means that he is special. On top of that he fuses the Rasengan with the Chidori which say a lot about his greatness. Don't try to undermine that fact.
Your second point doesn't make any sense as it is not confirmed that he is the strongest but
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Pulling off a Shadow Clone tech like that while fooling his dad is impressive and I would say definetely more impressive than what Sarada has done since we have seen those techs since beginning Part 2 Naruto. Quite boring honestly.