In fairness, both players were 6'10" (though listed as seven foot), but that's where the similarity ends. The first poster obviously never saw either player until they were well on the downside of their careers, because he has no idea what the young Hakeem was like. And obviously no memory of his entry into the NBA as the entire draft process was changed because Chicago was unhappy with Houston getting the most hyped center to enter the NBA since Ralph Sampson (and boy did Houston blow it by not taking Chicago up on the Jordan and a first for Sampson offer). Ewing was never considered as good as Olajuwon in college, the big Ewing hype didn't start until he reached New York. Ewing was another highly skilled big man with solid all-round skills. Hakeem was something that no one had seen since Wilt entered the NBA.
The NBA was used to highly skilled big men (like Walton or the forgotten Alvan Adams), ultra-athletic big men (like Kareem, Wilt, or the pre-injury JBC), ultra-physical big men (like Moses Malone, Wilt, Wes Unseld, or Dave Cowens), or even strong/massive big men (like Artis Gilmore or Unseld). What they weren't ready for was someone that combined Kareem's athleticism, Gilmore's bulk, Moses' physical play with a lot of skill. The only player, historically, that compared was Wilt. The only modern player that can seriously be compared to him, at this point, is Dwight Howard (keeping in mind that this Dwight is as old as the rookie Hakeem). Bynum bears no resemblance to Hakeem, and shouldn't even be mentioned in the same sentence unless that sentence is "Bynum has zero chance of ever impacting the NBA like Hakeem did." His example was horrible (the moreso since Magic and Bird dominated the 80s with their respective teams and Jordan dominated the 90s with Pippen and the Bulls), but largely because all he knew of either player was what he saw in
Basketball Reference. Olajuwon was better than Ewing, true. But it's not really a comparison you can make with Bynum and Oden until we see how Oden bounces back from the surgery. If he's even 90% of his pre-surgery athleticism then he'll be a whole lot more athletic than Bynum is even in Andy's wet dreams.