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Is it possible to un-disavow a link if we later decide that it isnt spammy / undesirable ? (i know best practice is to get it right first time, but worst comes to worst is it undo able ?)

So, I get the smoothie that is page authority and domain authority and the link metrics that Moz uses to predict how well a page will rank for a certain keyword. I can look at a specific search term where we are on say, page 2 or 3, with a page authority of 1 and domain authority of 26, I get why competitors rank above us. But then I look at a keyword that is much more competitive, where we rank #2, which is awesome, where the landing page is also showing a page authority of 1, and domain authority of 26. How can we rank higher than competitors with a page authority of 56 and domain authority of 65? Their onpage optimization for the keyword is no worse, and sometimes better that ours but we maintain this ranking. By the way the competition also have hundreds if not thousands more linking root domains than our page. Any ideas why one keyword is a rockstar and one is a dud, with the same poor PA and DA?

My company is setting up our support site.  It has been suggested that we set it up as a separate domain - www.company-support.com, rather than setting it up as a sub-domain (www.support.company.com) or the usual www.company.com/support.  The person who proposed this believes it wlll create link juice, but i wonder if splitting the traffic will create more harm than good?  Opinions please!

Hello I have a few competitors ranking VERY well for exact keyword match URL. They have a single hosted page, when a customer clicks to buy inventory ir re-directs to there main url. Will google eventually catch on to this? Excellent position, very little backlink/seo work.  Is this something that I should also look into for my own site? Thank you!

I know a site that has a DA51 but the mozrank is like 5.95   I thought the same components made up those rankings? Can someone explain the difference?