If I understand what your issue is - it's something like this:
"Hi Bob, can you tell me the Average wait time for our call centre yesterday?"
"Yes Boss! Total Dropped calls was 12, we had 3040 total calls inbound, of which over 99% were answered, Average handle time was 5 minutes per call, the longest wait time was 15 minutes and.."
"Just the Average Wait time, please"
"That was 56 seconds"
If the above is correct, then it could be a couple of things - it could come from an insecurity that they are trying to mask, by over-delivering on Information (to give the appearance of being knowledgable and competent)
It could be that their previous Team Lead liked to receive information in this verbose manner and so they are simply continuing this method.
Regardless of the reason - Here is what I would do:
Sit down with them and say something like
"It's clear you are very knowledgeable on these areas, and I greatly value your input. Can I ask that when I ask a specific question - before you expound, give me the specific answer (feel free to use the example above) first. That way, I've got the info that I need right at that moment first. If there's other items that are important, you can let me know after"
I have had a tendency in the past myself to give verbose answers and so I've learned that for direct questions (where there is a 'correct' answer e.g. 56 seconds being average wait time) a direct answer is best and then if needed, you can expand later.