Quote Originally Posted by Dree-Elle View Post
/snip
It might be wise to go ahead and collect all the minions you can. However, it’s not like you won’t be able to win if you don’t possess rare minions, so don't worry. Also, we'll have a rating system for matching, so you'll be matched depending on your win rates.
http://forum.square-enix.com/ffxiv/t...d/page2http://

Just from what Bayohne said here, I'm guessing "bought" minions from merch. or the Mogstation will not give you any extreme kind of advantage, but it seems each minion will have their own unique type of stats and such.