Idk. Best we can do is compare him to, I believe, the greatest defensive CF in the previous generation, Andruw Jones. I don't think it's controversial to say Jones should be in the HOF, but he's hardly top of the CF class. Even so, I guess you can make the argument that Buxton lines up, talent wise, with the future HOF Jones. Both exceptional fielders with 111 wRC+.
As for this desire to fans to vouch for the character of a man they do not know, it always makes me super uncomfortable. They are an entertainer and you enjoyed the entertainment they provided and the manner in which they did carried themselves while they did so. All valid.
But Twins fans twice celebrated long-time CF that turned out to be pretty different than their public personas. I, for one, will not make it thrice.