To expand on my ranking earlier on, the most portable/scalable skills in basketball are finishing, shooting, defense and passing. These skills scale up the more talented your teammates are simply due to the fact that they aren't dependent on touching the ball to provide value to a team. The best young hybrid forwards in the league, eg. Simmons, Ingram, Tatum, Siakam aren't really good enough to be that high usage perimeter engine in the vein of Jordan/Kobe/Bron/Wade/Kawhi (I'm warming up on Kawhi a LOT this season, his passing is on another level compared to his 2019 championship run) assuming that what Siakam and Ingram are showing this season is merely a hot streak, so how we should rate them as of right now is their efficacy as a second/third option on offense (which can be incredibly valuable, there's only so much value in having a #1 guy on offense, eg. the 2008 Celtics' best player was Kevin Garnett and they still won a title with his #2/#3 qualities lifting his team offense enough to churn out a championship calibre season alongside elite defense, check stats like SRS to see how dominant that squad was).
I'd rank them like this right now:
1. Siakam
2. Ingram
3. Simmons
4. Tatum
Although Ingram's stats are nuts atm, I think he's been unreasonably hot to start the season. His numbers overstate his offense and defense - he still can't drive inside and finish through contact (his preferred move is to pull up for an inefficient midrange shot that's somehow automatic for him so far), and his defensive numbers are pumped up due to the free safety role he gets. I think Siakam's statistical jump is more indicative of his quality (although they're still likely to be inflated a bit) - his passing and shooting have improved, and his defense has slipped a bit (although he's still a good defender), but he still gives you that excellent two way complementary piece that can now be a viable centrepiece. I don't rate Simmons much, his shooting is still god awful and his passing is overrated (the majority of his assists come from post ups and transition plays), but he can still give you a very additive package based on his defensive versatility, finishing and passing (yes it's overrated, but it's by no means bad) that can scale on any team that doesn't have poor spacing. I think Tatum's as good as those guys when it comes to pure "goodness", but I think that his current skillset is between a rock and a hard place - his game is designed to be an offensive centrepiece, but he hasn't developed enough to be a viable high usage engine, and his complementary skills are pretty eh (good outside shooter and plus defender, but is a meh passer and finisher). If Tatum cleans up his passing and finishing as the season progresses I could see him jumping up to #1 in the list, but I don't think I can justify putting him above those forwards right now. Ultimately it's a super small sample size so we'll probably have to wait until the new year before we can start to form any real opinions when it comes to such young players.