Voronov has good flow over the ice - he's not choppy at all. A lot of people have commented on his good basics. So I don't know what you're talking about. What he needs, imo, is a better choreographer, because there is not much going on between the elements (or is that what you mean?). He also landed the quad at Europeans as well as in both the LP and SP at Worlds and I believe Russian nationals. So it's not like he's just landed it once and he skated most of last season recovering from a foot injury
I hope Borodulin does well. He was amongst my favorites at JW.
I find Voronov a pretty boring skater, because, as you say, there isn't much in his programs but jump, jump, jump. However, Mroz isn't any more compelling than Voronov.
I am also wondering if part of the reason for DomShabs' coming to the US to train is the condition of his knees. He still has not completely recovered from his surgeries and mentioned consulting doctors in the US. Perhaps he is not satisfied that he is getting the best medical and rehab advice in Russia.