[P. Fuller]

1. Adding in a second motor is not necessary by any means, it will increase the overall torque output but thats about it. You might need that, or you might not; depends on what it will be used for exactly.

2. Here are my 2 cents on your problem with your friend. This kinda seems like a "battle of the egos" type of thing. I would explain to him that you have the experience the team needs, but if he still has a problem, just let him have his way. You should go and talk to a mentor in charge, they will be able to resolve this.

Hoped that helped a bit, good luck good luck with all this.