I don't know, I think all advanced stats have some flaws, but sometimes you can glean a lot from the totality of the data and your own admittedly subjective eye tests. There is also the context of this particular season and other variables such as rosters, coaching, injuries, and such, but you try and do what you can with a reasonable sample size. I mean, with the four players mentioned this season:
VORP: Jokic (#5), Butler (#9), Tatum (#11), Embiid (Not in Top 20)
PER: Embiid (#7), Jokic (#10), Butler (#12), Tatum (Not in Top 20)
Offensive Rating: Butler (#13), none of the other three are in Top 20
Defensive Rating: Embiid (#11), Tatum (#18), other two not Top 20
BPM: Jokic (#7), Butler (#9), Embiid (#11), Tatum (#16)
W/S per 48: Butler (#9), Jokic (#15), Embiid (#19), Tatum out of Top 20
I don't think anyone can easily and definitely say that Player A is clearly better than Player B but that's just me. My personal opinion is that Butler is and has always been (after some years in the league) a Tier 2 star player, but is not quite the same defensive player, at least recently. Embiid has a very high ceiling, but his conditioning and health are just big red flags. I'd personally right now take Tatum over the other players even if they were all the same age based on skill set/ceiling. This is admittedly a subjective eye test thing in which I see flashes of things from him that I think can translate to a higher potential over time. I have this same eye test at times (so it can be flawed) with superstar players too. For example, I have no issue with arguing Kawhi is the best player in the world possibly right now, but I've never once in my life seen him play and thought that he could ever equal LeBron James in his prime. A few times, I have seen Durant play at a very high level and I think if only he had the court vision (this helps both on defense and with passing) to match his other skill sets...maybe he could be a Top 10 all-time no doubter type. (I still think he has a shot)