Although , double closing is more expensive , I feel it’s a little more legitimate than assigning.

I grew up on the east side of the town with a well versed knowledge of the neighborhood.

My logic behind a area to hold is basically is in my zone of knowledge that means close in and in a  A-B area .BIG fish can have the whole USA in their  zone .Outside of my zone I am thinking flip it there are exceptions like all rules . 

This deal leveraged strategic financing, value-add renovations, and market knowledge to deliver a strong return.

-A water heater issue resulted in repeated mismanagement—confusing unit assignments—leading to extra costs to fix the same issue 3 times and on each occasion "more fixes" needed to the water heaters that I plumber said was needed.

We even had to do a lease back to them while the carport situation was being finalized.There is definitely some luck involved with every deal, but I think as investors we can create our own luck as well based on knowledge and experience.  

Find as many investor meetups as you can as the knowledge others have are invaluable when you're first starting out. 

Or is it possible to assign all of a sale to 1 member who then exited the group?

You will also likely be paying more than more experienced investors as you build your team and knowledge.

You are always helpful with your advice and knowledge here on BP.