The answer to question 2 is that the players are playing out of their position.
When match orders are not set (which is obviuosly the case as the team is bot-controlled), the computerized manager selects formations following some weird rules. Something like: the best player in the roster, wage-wise, is the starting PG, the second to best is the starting SG, and so on... so basically positions are decided regardless of players' roles and a C may play as a PG or a SG, and vice versa.