John Banks is correct, I should have commented on the article itself... but I think it is still important to know something about Stratfor.
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Per the article, the author says himself, they will not go full speculation but it is mostly in the direction that the Russians could have had something to do with the assassination, that's why "Lee would not be alone" because per the article, it makes it sound like Marina could be part of it. That seems pretty far-fetched.
The article also mentions the relative ease that it appears Oswald and his wife were able to come to the USA. I think stats have been checked out as in Posner's "Case Closed"; and it was not always that rare for people to return from Russia somewhat unfettered. Cold War was on but still, a number returned.