There is now way you can do a 'better choose' with only an interview, talking, wtv... The only way is to see in practice as guests (but it's rare and very difficult to find) and we have at least a few good examples on that ... Edda&Joe, Misty, Mira&Henry, Clara, Drew&Bree..
There will always be failures.. There will always be shy people... there will always be people that in theory are awesome and then in practice fails (and this goes on too for our real life in our jobs)
Even the best manager crew have fails (Rock)