Board Thread:Episode Discussion/@comment-14138255-20161211174540/@comment-26018514-20161220195749

WC-83 wrote: There's nothing wrong with those, with one big exception: they aren't personal. .... There is more to it than that, the choreography involved can be nightmarish... and Monty appears to have been their only animator capable of it. Look at the fights of Volume 4... it's obvious that the most important thing they are lacking at the moment is someone who can look at the big picture and keep track of where everything is at all times... and most importantly animate what is needed to fix problems.

In other words, 1v1 is done so often because it is far easier to compartmentalize, which makes it easier to create.