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If its possible to avoid a redirect, do. www.corporatesite.com/product/ -> www.consumersite.com/product/ is better than adding a redirect into the chain.

This is where hreflang tags come in. Here's a great diagram I found: https://hreflang.org/wp-content/uploads/2015/12/mobile-hreflang-canonical.png on this site: https://hreflang.org/use-hreflang-canonical-together/

Hi Sam, I can see how this might be concerning. Without knowing your site, I can't confirm anything but answers to your questions: Bots have been known to "fill out forms" before and at least Googlebot has been known to find pages through the use of Chrome (a user using Chrome). There are many ways, but if you are sure that there is no link to it anywhere, I wouldn't worry about it. No. That is what header codes are there for, to let the bots know what is there, what is forbidden, etc. Other than robots.txt, there isn't any way to stop them from sending in requests. If it gets out of hand, you can try talking to AdWords directly, but more than likely, this is not causing an issue. Overall, I'd just let it happen. Let them get the 403 error and they'll figure it out. As long as this isn't showing in the organic index, you should be fine.

It used to be that titles only came from two sources - the <title>tag and DMOZ. If the organic result title didn't match the title tag, then you'd check DMOZ. Unfortunately, now Google pulls data from all over the place, including Google+ listings and the Knowledge Graph. Google has become very interested in understanding brands as entities and is bringing a lot of data into play, sometimes poorly.</p></title>