crawlability SEO question
 

Hi, I was wondering what you think about next.

If a particular page can be found inside the Google index ( cache: URL) but it is not linked from the index page of a site, will a link on that page still be valuable for SEO purposes?

thanks

You mean an orphaned page. No I don't think it will have much if any value.

I am unsure is an orphan. I don't think so because it is linked from the blog root, but I can't find the connection and flow from index (not even to the blog). Site is too big, I am using Screaming Frog to try to find it but it lasts for hours, and still no results

You can look into search console to find the page there and it will show you how to get it indexed. Normally if it's not indexed then google can't see it.

it is not my site. I am trying to figure out if is it worth getting a link there considering this situation.

I have noticed how some sites will sell blog posts with the blog being linked from the index page then at some later date will remove the link to the blog so all the posts become worthless.

If you have access to Majestic SEO then check the TF and CF of the page, if they are both zero then avoid.

it seems blog index page has TF 14, CF 33