Pac wouldn't have to overcome obscene height/reach/size advantages against Lomachenko. He wouldn't be reliant on his legs to close the distance. Teofimo found Lomachenko's body with impugnity in the early rounds. Pac even now hits faster/harder than Teofimo. I'm only worried about Taylor and Mikey at 135/140.
I love watching Loma fight but he is not a ATG imo. To answer you other questions there is no one he can get in the ring with that is good enough to put him as a ATG boxer at this point. There has to be other potential ATG fighters or at least great fighters for him to fight to get there.
I think ATG label is worthless since there aren't strict criteria for it. Many would consider Ward an ATG.
IMO, the ATG fighters that are either still fighting or fought within the last 10 years the list is Pac, Floyd, Hopkins, Roy & Marco Antonio Barrera. No one else makes the cut imo, maybe Marquez but that's pushing it.
Erik eh... Wlad is a hard one too, Like Larry Holmes & Joe Louis his era of challengers was weak, they were just more dominant and could stay upright and conscious when caught.
You might be the only one who doesn't count Wladimir as an ATG, which shows just how worthless that word is.
Toilet paper's peace is more worth than HOF or ATG noise nonsense. If Ward is HOF, then Ottke too, at least Ottke did not had used low blows to get hometown cocked wins.
Okay, Muhammad Ali & Lennox Lewis are ATG fighters belonging on the same list as Robinson, Pep, Mayweather & Pacquiao. Wlad is a ATG HW, but does not belong on the same list as Robinson, Pep, Mayweather & Pacquiao.