Question about Chocobo Breeding

So, I'm on the verge of a rank 40 chocobo, and I'm saving up to get my Chocoho (You rent a chocobo to breed with...yeah)

What I want to know is can you use a Pedigree 9 Coverage Permission thing with a Pedigree Rank 1 Chocobo for breeding purposes, or do you have to use Rank 1 with a Rank 1 and so on and so forth. I've tried looking at all the information in game, and I don't think I saw anything like this, unless my eyes are worse than I thought, lawl.

This is my Chocobo by the way - http://prntscr.com/69liui

Can you not retire your first chocobo and train another to breed with your retired one? Thought you could do that as well as rent a partner. :3 I'd like to know this too though! Deffo need more in depth answers in game.

There's a post on reddit that explains quite a bit about the chocobo breeding process: http://www.reddit.com/r/ffxiv/commen..._works_so_far/.
To answer your question specifically, you can breed any number grade with any other number grade, so breeding with a 9 would probably be the best idea.