The are many possible design permutations if you go down the road that Brawn/Toyota/Williams did which would lead to quite different final solutions. But, they are all based on the same initial premise - and it is that premise that will be protested/needs clarification.
Im all for clarification - what annoys me is that teams are being hampered with imposing bans when its not their fault at all.
Undoubtedly the FIA got it wrong - by not notifying the refused teams when they had their minds changed, but that shouldnt count against Brawn etc
Not only that, but did you actually see the application /refusal - Im just wondering if Renault / RB got refused because of a slight detail included in the initial proposal that the allowed teams got around another way