This is a rather subjective debate IMO. Though I think Rocchio is indeed a ML caliber SS, I think he is also the most likely to get "pushed off" the position because he could play GG 2nd and maybe even in the corner OF.
It really comes down to the performances of Arias (our best internal option for long term 3rd base play IMO) Freeman (does he land at 2nd) Gimenez (can he hit enough to play regularly in the ML) if he can, he lands at 2nd/SS and personally I think Palacios is way overlooked in general. I think the FO is much higher on him than we consider and unless moved to a corner (only played 2B and CF in 2021) is also in the top end of the mix.
Oh and then there is Clement, Chang and Miller.
And finally there is Tena, someone we don't know much about defensively but he made the least amount of errors as a "regular" SS in our system this year.
Is it Rocchio, Arias, Gimenez, Rosario, Freeman, Tena? Hopefully the cup runneth over and doesn't fizzle out. Should be a fun follow