Mike's guys could end up being guys he brings into town once he's cemented himself in Gus' organization which is happening now. I also think Gus trusting him to help organize everything lines up with the skills he's shown by actually doing his security role...and it fills a gap. Mike was clearly bored and wanted to be more useful which is why he was doing all that so it's a win/win for Gus. He showed him he has that skill and is willing to do it...and it keeps him out of "trouble" with Madrigal.

Some stuff is moving fast and is going unsaid but nothing major in my opinion...you can fill the gaps on your own for the most part. the only part that seems off is the grand daughter's age...but child casting is tough so i'll let that one slide.