For me it would be Tom. He has run a business. Created a product from scratch, sourced it, patented it, sold it. From a business point of view, there is no more qualified. He would need some direction, which Shugs could provide.
In second place it would be Susan, again has run a business, thus knows the basics. She would require too much baby sitting for me. She also talks a lot of sense at times, however she talks way more rubbish. So would require patients.
In third place Jim, can sell/but products all day long. He does seem to do to well with facing the public/buyers/sellers. However the business side would let him down.
Finally Helen, she would be great at organising things, booking appointments. Thats about it. She would be well turned out, and be able to give a pitch. Apart from her pitching skills, a £20-25k a year PA could do her job.