Reading the abstract, they didn't mention which sources ended up making more power, but I'd guess that (iii) an accretion disk, and (vi) relativistic jets are biggest.
However, my first thought is wouldn't the Dyson sphere itself get in the way of the accretion disk?
Stars are generating energy by fusing previously accreted mass. But black holes need new mass to accrete and accelerate to add energy. It seems a hapless incoming star about to get spread into accretion disk material might do some serious damage to the Dyson sphere?