Thank you so much! This is exactly what I needed to understand. I had suggested using Lean On Me during the discussion at the table, but I think the player was attached to the idea of using +Calculating because it gave him better odds and fit his character concept. However, I hadn't considered the ability to choose 1 more or less option in the Lean On Me result, and I think pitching that to him would have helped.
The group at large is still a bit confused about Share Expertise as a general move. Can you give an example where a player might want to use it? Is it always used to establish something new in the fiction? My players have been using Scope It Out to ask me questions that I haven't already answered, but Share Expertise says the player should ask me a question. Since Scope It Out and Share Expertise are both roll+Calculating and both about asking questions, when should each apply?