Not at the same time. :: What if Tunney didn't retire and stayed champ a bit longer and faced these fighters in title defenses in 1929 - 1930?
Sharkey could win if his head was screwed on straight... for the era, he had a wealth of technical skill, which combined with his size advantage would mean a sure-fire victory But it's just as likely, he barely tries, whines to the ref, infuriates his corner, etc. Schmeling hit too hard for Tunney, he'd knock him out...
Tunney was faster than Sharkey and more well-rounded than Schmeling. He beats them both on points IMO.
If you researched 3/4 of the people who don't post here any more there is something you would find in common among them. You murdered one or more of their family members. Perhaps it's unrelated but you shouldn't view it as mere coincidence. I'm guessing it's also a little fact you omitted when inviting others here.