False. Odoe like calm water. Show me one bigger than 14". My tank has plenty of dw. Odoe can live in a 120, more length it'd surely be happier though. Skittish depends on the specimen. Mine begged like a cichlid at times for food and would chase my finger if I waved it back and forth in front of the glass fast. Mine was fine with a jag. When it comes to cohabitating fish there's no definitive answer. So to say it will "no doubt be bullied" by a fish that isn't even that territorial (oscar) isn't the brightest. You can get a very mean odoe and it kill the oscar or vice versa. Or you can get two average fish and be just fine. If it comes down to a fight my money is in the odoe, faster and larger mouth and teeth, will do more damage, not to mention oscars are easily put in place majority of the time. I'd say the cichlid produces more waste. Odoe isn't a messy eater. Can't say I saw it deficate in the 3 years I had it. My odoe grew 2" a month to 8". Faster than any oscar I've ever kept. But that's an exception I'd say. I was feeding plump feeders every day.
Also the payara in question is a scomb. Show me one larger than 12". So the need of a massive tank I guess depends on what massive is to you. And if your talking about large payara you'd be meaning armatus which would no doubt kill an oscar imo.