Talk:Epic Rap Battles of History 52/@comment-5482968-20150321024747/@comment-24955246-20150321112145

http://nicepeter.com/blog/blog/the-saddle

"We chose a couple matchups to start writing, lined up two very special guests returning, found some great beats to start writing with."

It doesn't specifically say that the two guests are for the first battle, nor does it say that the two guests are linked (eg. Smosh, Rhett+Link). But it is most likely inferred to be that way.