Sun Aug 13, 2017 11:58 am
SEHQ Brainstorm brings back all keywords that people used at the search engines to find your pages in the last 90 days. So there are no reports in the Keyword Searches Report of anyone using "pencil grasp development" at G, B or Y to land on your site. Because G doesn't report much these days, it's possible that G is sending a lot of traffic to you, but the MKL doesn't know that because G isn't saying. You can check yourself in Google Search Console.
If GSC confirms that G is sending a lot of traffic, then it's the main source of search traffic. However large that number turns out to be, it probably won't be as large as the Traffic Stats number, because that number is a total of all visits to the page, which includes search engine traffic, social media link traffic, video link traffic, directly typed (in the address bar) traffic, and clicks to the page from other pages of your site.
I was going to recommend you add "pencil grasp development" to your MKL as a single keyword with Add a Keyword so that you can start receiving numbers for it in the future. However, since that keyword is in the Keyword Searches Report as a keyword that sent traffic to the page, the SEHQ Brainstorm should have, from my understanding of the process, added the keyword to your MKL.
So I'd like you to open a ticket with Support. Include the URL for this post (my reply here) and ask that the developers investigate. It's possible that the keyword was not added because it's already being used for a page (which is a possible use case that was missed).
To answer your final question, the # SE Visitors numbers are the total for each keyword from the previous 90 days. So if you repeat the SEHQ Brainstorm in 30 days, many of the numbers will be different.