You can get round the pronoun thing quite easily.
Is the person there?
If yes, address them directly.
"That's a crucial point from David," - turn and face David - "especially what you said about the depletion of government grant in that area. It ties in with Marion's graph where she displayed the rising demand for this service, and how her department's already creaking."
If no, use the person's name to make it clear who you're talking about and then turn it round so you're talking in the first person.
"In our meeting David made a really crucial point about the depletion of government grant in that area", or "I'd like to explore the point David made about the depletion of government grant in that area".
"Has anyone seen David today? I wanted to follow up on the issue of the depletion of government grant in that area."
You: "Is David in today? I wanted to discuss the issue of the depletion of government grant in that area which was raised in our last meeting."
Other colleague: "No, I think he's working from home today."
You: "Oh, no worries, I'll send an email/set up another meeting for next week."