Please excuse the necro-bump. I debated making a new topic or derailing the other topic I’m taking the quote from. Since the forum suggested this was closest to what topic I would’ve made… Well, here we are.
I’ve had the idea of player created contracts in the current game working a similar way.
There’s 2 ways to go. 1) A series of contracts leading up to a final one.
Or 2) a tree of contracts all stemming from fewer, all back to one starting contract. Kind of like a ‘Choose your own adventure’ where the player makes a choice of which contract ID to go to next. This idea is a much larger undertaking.
To do this, one (or a group of people collaborating) would have to work their way backwards. Starting with the final one (or more) contract/s, then (going backwards) reference the next upcoming contract/s in the briefing of that current contract. That’s how it will appear when all contracts in that series are completed.
Of course, there’s nothing to stop anyone from obtaining all the contract IDs and playing them in whichever jumbled order. So it’d have to be as if the player/s was/were roleplaying.
In a way, this almost sounds like a FC or curated batch… Which would appear in order if done like the 1st example without referencing any (next) contract IDs. But as for branching? 
I hope this makes sense. 