In fairness the original premise is flawed... the greater the number of party members, the less the choice of class matters from a mechanical perspective. It's like a molecule with a negative charge - the larger the molecule, the more able it is to stabilise the negative charge.
If you're going to have a "one class party" question like this, it should be based on the classic 4 member party structure or from the perspective of a solo PC adventure.
It may sound pedantic but when it comes to discussions like this, maths and science matters!
