The annoying thing about Pacific Typhoons is that information on them tends to be sketchy and inconsistent. I got that <872 millibars reading for Zeb from a website ranking some of the most powerful tropical cyclones ever. This was also the site that mentioned the rumor that Zeb acheived higher than an 8.0. No other website I have looked at has confirmed the 872 milliibar pressure estimate or this rumor.
Angela is also an engima to me. I've seen several sites mentioning an 8.3 on the Dvorak Scale for this storm, but the pressure estimates were listed as 900 millibars which really doesn't make sense. Afterall, if it really got an 8.3, I'm surprised its not thought to be the most powerful ever.
Finally, there is Typhoon Tip. For the storm with the lowest recorded pressure ever, you'd expect it to be a perfectly formed system, but in pictures of it dated from the day when the 870 millibar reading was taken, it doesn't even look like a hurricane: no eye, not circular/symetrical, gaps in the cloudmass etc.