I have bever been asked about my job or who paid for the tickets, now they can ask what they want but they tend to follow certzain common question at least for the vast majority of those entering.
He did not bring a lot with him, that should not be an issue.
How long did he plan to stay?
I assume something happened when he sought entry, I have never been asked more than 2 or 3 questions, where am I going how long who am I visiting and once how much cash I had on me, a few dollars.
What raised their interest, a very long visit?
You can’t marry your brother to get an immigration benefit any longer?
I doubt it makes any difference not sure many are impacted.
i would also question what did you expect to happen?
I would move heaven and earth to get the Divorce completed earlier.
She can hardly sign anyway as you are separated, you are not in a good faith marriage.