Itachi's stamina isn't actually all that bad when you think about it, even with sickness.
He outlasted Hebi Sasuke, who outlasted Deidara, etc right before his body was about to perish.
Without sickness, he probably has quite a lot naturally, as he was using jutsu like Tsukuyomi as a young kid.
But yeah, imo:
Sick Itachi < Minato < Healthy Itachi ≤ Edo Minato < Edo Itachi (infinite legendary items & Susano'o)
Idk. I see your point but still that was 3t Sasuke. Itachi's plan all along was to drain Sasuke's chakra so he could get to Oro's but in doing so he ended up killing himself. What that pretty much says is that Itachi's stamina is just above 3t Sasuke's stamina. Not saying 3t Sasuke wasn't pretty durable, but it's nothing compared to say MS sasuke who took on 4 kages plus Danzo or even an EMS Sasuke. The outcome definitely wouldn't have been the same if Sasuke were above 3t.
And let's face it Itachi most likely isn't going to defeat Minato with an attack. Not saying Minato will defeat Itachi with one either. But FTG is too fast for Amaterasu and Totsuka blade. And Itachi is fast, but he's not Minato fast, so he would most definitely have to keep up a Susanoo to defend himself at all times. And if he does that, then that Susanoo will give his position away every time since it's so big, meaning Minato wouldn't have to look at Itachi to know where he is, which means he's avoiding Tsukuyomi. And since FTG takes relatively no chakra, and I believe that Minato has more stamina than 3t Sasuke, he'll probably outlast Itachi in a fight, especially since Itachi will have to contstantly use Susanoo which means he'll drain his stamina even faster than against Sasuke
But Itachi's sickness really is his only weakness. There's no arguing that. So without he can pretty much beat anyone
**edit** anyone except for Edo Minato. Edo Itachi vs Edo Minato would be an obvious draw. Minato has nothing for Yata mirror. But Itachi has nothing for FTG. And if he uses Totsuka, that means he's using Susanoo, which gives Minato a way to keep track of Itachi without looking directly at him, which means he avoids Tsukuyomi. That fight would never end