A good question to ask during 1:1 is
What is the best day in the past 3 months or so?
What is the worst day in the past 3 months?
That should tell me a bit more what motivates him.
But I also like this question
What are you trying to improve nowadays, what’s your focus?
I asked Tom yesterday and it sounded right. I want to ask more.
Meeting with those guys 1-1 is a very good way for me to learn about them, to give them so addtl feedback, to react if need to. It also allows me to get some feedback.