Let's talk about facts.
BOB never had an elite RB in 2021 or 2022. BRob and Gibbs were certainly good, but not on that level. The only offensive player that was elite in 2022 was BY. Which means a lot of times, he had to win games by himself.
Contrast that with what Kiffin had in 2015. Coker was good, but everyone around him (Henry + Ridley + Howard) were top tier. Coker never had to win the game by himself. There were too many other threats the defense had to account for. This in turn made it easier for Coker to make plays. Bama had better offensive talent in 2015 than 2022.
Conclusion: You do not need an elite QB to win. A good QB can win if the other playmakers around him are top tier.
If Metchie/Williams had not gotten hurt in 2021, we would not even be having this conversation.
I couldn't find the "facts" in your post so I'll address the opinions.
Simply "good" players don't make NFL rosters and definitely do not start as RB's in the NFL. By the time BRob got his turn at RB he was definitely elite, just not in the same way Henry was. If "elite" was simply defined by being like Derrick Henry then there are literally thousands of RB's that have come through college football and gone on to play in the NFL that was "just good". Please don't tell me Gibbs wasn't elite, especially when ANNOUNCER after ANNOUNCER who called our games (Danielson being the main one, but there were definitely others) looked at Gibbs talent and said "he's special". That isn't said about "just good" players. How BOB used the kid made him ultimately look less than elite.
Regarding WR's, regarding football talent and athleticism, Ja'Cory Brooks IS ELITE, Kendrick Law (who I've personally watched play) IS ELITE, Isaiah Bond IS ELITE. Maybe the reason they didn't appear elite is because the standards within our program (specifically at practice) have slipped on top of the playcalling not being as "college level" as it should be.
And before you bring up Jamo Williams, 2/3's of his college coaching came from Ohio St, not Alabama. He transferred to Alabama because Ohio St's WR room was ridicously stacked with talent, but he still received the same coaching. Games aren't won on talent alone, coaching plays a huge role in developing talent and then in turn how that talent is used during games. Bad playcalling can make talent look untalented.