He decided to forego parrying since the cross guard suited him better. He had become much slower and didn't have the reflexes or agility to play matador or smother guys shots. That's one thing people didn't get about 70's Foreman, he actually had very good senses and reflexes otherwise he wouldn't be able to catch shots and deflect them or walk guys into counters. You really can't do that if you're slow, and he pulled it off throughout entire fights. It's just that Ali was so fast and refused to play his game that he made Foreman look slow and brutish in comparison. He tried several times to parry Ali but eventually got frustrated and targeted the body. That was by far his most popular fight in people's memories so they just assume he was slow in general forgetting how he looked in other fights. It's comparing apples to oranges. The mummy stance was good for Foreman for a while but even he couldn't parry or deflect everything. Even in some of his best performances he still got tagged by stuff and took his chin for granted knowing he could take a shot and didn't bother blocking at times. 90's Foreman was way more cautious and responsible. The cross armed block was perfect for a big guy with big arms like himself since it made it damn near impossible to land more than 1-2 clean blows on him. The block was like a stone fortress. Yes he had less counter punching opportunities, but it also helped him last longer and preserve his energy.
Although Foremans defense wasn’t the best I do find it amazing he left with his wits intact. I also think his speed in prime is a tad underrated. His one two anyway. I wonder how Ali would have done had he stuck with and listened to Archie Moore. I’m not sure anyone makes it through that lineup without some long term side affects.
I'm also curious how Moore would have taught him. The cross armed block certainly wouldn't suit a stick and move guy who likes to dazzle the crowd with fancy head movement. But as far as teaching the fundamentals, Moore was as knowledgeable as almost anyone and might have fixed some of the holes in Ali's style/strategy.
Foreman showed negative 100 IQ in his fight with Ali so I don't think that's relevant though lol.... But, Im not saying Foreman did anything wrong he simply adapted, and your 100% right on his reflexes, everyone calls him a brawler but he was far more than that.... Ive heard about those same reasons, but that only proves my point on how he was much less of a force by the 1990's.... Still not one to be trifled with, but age is a *****....
Perhaps you should start caring less? I used to get bent out of shape when I read ridiculous assertions over and over by large groups of people, even on topics outside of boxing. Then I just...stopped caring so much. I mean, if people really are making massively outlandish arguments in favor of Marciano then the appropriate response imo, if any at all, is to just respond with something reasonable rather than something of the same proportion but in the opposite direction. Although typically people who are unwilling to be realistic, in this case the "Marcianistas" whoever they are, wouldn't be worth a response.