I would pass on the male too, roosters take some experience. And how a rooster is behaving today, is no indication how he will behave tomorrow, especially in a new place. It might work, it might not. What is your plan if it doesn't work, if he becomes aggressive to you or the pullets. Roosters, (as your friends are probably aware of, can be difficult to get rid of).
But it might work, personally, if he is quarantined over there, I would not fret it. Ten to one, you have been to visit, and gone to look at their chickens, later on your own, so more than likely, quarantine has been broken. It is nearly impossible to do an accurate quarantine in small areas, such as backyard set ups.
Do get the chicks outside, and do get a run built, ASAP. I would not add a rooster until the set up is complete and the pullets are laying. At that time, they are ready for a rooster. Adding one earlier can be done in a multi-generational flock, but that is an established flock. Not what you are trying to put together. Patience will stop a lot of problems from happing. And some chicken problems can be ugly.
The best thing would to get over the case of chicken math, where more is better. And wait a year to add any more birds. You and your set up will be ready. Right now, you really don't quite know how your set up will work out, what the problems will be. Integrating is tricky, and some experience with chickens is helpful.
Mrs K