Possible indications of intelligence involvement by Marina Oswald

[Zeon Mason]

Maybe there’s something here with this KGB angle that Tom is delving into which is more than what the WC was willing to reveal.

So why was “Mexico Man” (= Pro KGB assassin) sent?  Was Oswald  to facilitate helping this guy enter USA or was the KGB guy coming to STOP Oswafd from carrying on with an earlier directive from KGB that was given during the 62 Cuban Missile crisis, which order had been removed after the diplomatic resolution of the crisis.

Perhaps the KGB were worried their Marxist American Oswald puppet might ignore the new stand down order and on his own carry out the previous terminate JFK order which was no longer necessary. Kruschev got such a  good deal from JFK in resolving the 62 crisis that Kruschev considered JFK a US President that the USSR could work with towards establishing a less hostile stance with regard to use of nuclear weapons. It was essentially the beginning  of the MAD doctrine.

[Tom Graves]

So why was “Mexico Man” (= Pro KGB assassin) sent? 

What makes you think the burly "Mexico City Mystery Man" was 1) a pro-KGB assassin, and 2) sent?