unlikely, and, knowing Bates, impractical
What's so impractical about subterfuge?
Why assume that Bates hobbled around himself to buy the ticket(s)?
Why assume that Bates or a confederate bought both tickets at the same station at the same time?
This confirms my suspicions: no one here has had to live by their wits. It's all knitting, suburbs, 9 to 5, compliance and conventionality for 'you lot'.
Mary killed Green. She had motive - loves Anna and would never wants my harm to come to her. Knowing what happened to Anna enraged her. She will frame Tony with it as she asked I'm to fire him - how could it be her? Of course it is her. Ironic that she and Anna were in London together. Last, it was all stAged in letting Tony think She was interested in marrying him and now distancing herself from him. It is all calculated by here.
What do you think?