Can you provide evidence of an occasion Oswald took all his money with him after visiting Marina at Ruth's? If not, your argument is nothing but self serving speculation. Why did he take $15 that day? Leave it all for Marina and the kids. No need if he shoots. No need if he doesn’t.
Why did he take $15 that day?
If Oswald decides to not kill Kennedy then Oswald needs a weeks worth of money for the bus, for lunch and for dinner and perhaps to pay for his room.
Leave it all for Marina and the kids.
See above.
Marina unhelpfully testifies that she never counted the money in the wallet in the wardrobe but she does say that Oswald did put money that he didn't need in the wallet, which could be anything and is equally unhelpful.
The main point from the following testimony is that Oswald was acting in a way that was unusual for him which while not conclusive is powerful evidence that he was considering an assassination.
Mrs. OSWALD. Yes, in my room at Ruth Paine’s there was a black wallet in a
wardrobe. Whenever Lee would come he would put money in there, but I never
counted it.
Mr. RANKIN. On the evening of November 21st, do you know how much was
the wallet?
Mrs. OSWALD. No. One detail that I remember was that he had asked me
whether I had bought some shoes for myself, and I said no, that I hadn’t had
any time. He asked me whether June needed anything and told me to buy
everything that I needed for myself and for June-and for the children.
This was rather unusual for him, that he would mention that first.
Mr. RANKIN. Did he take the money from the wallet from time to time?
Mrs. OSWALD. No, he generally kept the amount that he needed and put the
rest in the wallet.JohnM