Bit of both actually Ben, a few parts where sculpted separate at the start, and a few parts where retopo's like the armour bits. Its a lot different work flow than for film lots and lots of dynameshing. Yes no wholes is the big rule to follow.
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb