Okay, I see where you're coming from. But I gotta disagree with some of this.
1) Have you seen those guys fight? If not, how would you know that they couldn't compete in this era? I believe great fighters can compete in any era, that's why they're great. You're also making the mistake of putting them in a time capsule instead of giving them the adjustments of the advancements of this era, which they would have if they fought in this era.
2) Yes Ali would be great in this era as well. No he wasn't technically perfect, but he didn't have to be. Few could handle his imperfect style because he was great enough to make it work. Plus you act like fighters today don't have unorthodox styles. Roy Jones had his hands low and lead with hooks. Vitaly Klitschko kept his low and backed up in straight lines. Still ain't stop them from dominating.
3) I'm not automatically classifying them as better. I believe they are better by looking at their resumes. You're making the mistake of thinking I'm ranking them by talent. Which isn't the case. Fighters (and athletes in general) aren't ranked by their skills, but rather their accomplishments. Talent is great, but if you don't do anything with it, it means nothing. There have been plenty of fighters who were talented, but were lazy and underachieved (Leon Spinks, Riddikk Bowe, Hector Camacho, Wilfred Benitez) which prevents them from being ranked higher than where they are. And it's hard to rank newer fighters over older fighters, because the game has changed so much. You talk about Henry Armstrong, this is a man who held 3 titles (FW, LW, WW) all at once, at a time where there were only 10 titles. So he was defending them all the time, all against the top guys in his division, while having a 10-15 pound disadvantage frequently. Thanks unheard of in today's era. I don't see how anybody these days can top something like that.