HAHAHHAHAHAHAH... wait... are you serious?
Let's go with top 5.
Money.
Professionalism.
Not making press releases for a mod using a game that hasn't been released yet.
Experience? (I have no idea who is on the team, so...)
Not "planning" a mod, and then putting out a "casting call" for characters.
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So this is actually a professional endeavour? I don't understand why a professional outfit would make a mod for a game unless they were going to charge money for it, which it appears they aren't. This is a pretty large undertaking, what's in it for them?