Most of what I've read about Collins suggests he's mainly a forward though. Perhaps, like Mangan, he's capable of filling in out wide, but if match-fit, Sousa as the natural wide player you would expect could do a better job.
I didn't think Braintree set out totally defensively, they broke quickly and had players supporting their main forwards. As we saw last season, Dover are good at cynical and niggly, so while their players are have more quality, I'm not sure their game plan will differ greatly.