To put it nicely, attributing that phone call to Ruby is farfetched. Would a planned event allow for Ruby to sleep late, go to the Western Union to send a meaningless money order thereby bringing him within just a few seconds of missing his chance, and bring his dog for the ride? It has all the hallmarks of a spontaneous event and none of a planned event. And all these years later there is no credible evidence that associates Ruby with any conspiracy to kill Oswald.
Gosh, that's silly. What is "farfetched" is to claim that Grammar just fabricated his account. I swear I hope none of you lone-gunman believers ever works in law enforcement, because you would never catch anyone.
The Western Union money order was clearly an attempt by Ruby to make his hit on Oswald seem like a spontaneous, compulsive act. Even the HSCA did not buy it.
If Ruby had waltzed into the basement the way the WC said he did, via the Main Street ramp, the spontaneous-act story would have a tiny bit of credibility, which of course is why the WC claimed, against all the evidence, that Ruby entered via the Main Street ramp.
But we know that's not how Ruby got into the basement. He entered via the circuitous route of taking the alley next to the Dallas Municipal Building and then using the stairway that led to the basement from that alley. And, conveniently enough, the door to the stairway was unlocked, and the entrance way at the bottom of that stairway suddenly became unguarded shortly before Ruby used it to enter the basement.