I believe we should reward people for previous work,

Let's step through the opposite scenario:
I don't do any work for the project, I just now make forum proposals,
I wait 2 weeks while we debate, my proposals get approved and budgeted,
and then January 1st, 2018 I start the Twitter, Reddit, Advertising/Marketing, Technical Writing, Testing and Documentation.

Would this have been best for the project?
Would the project have grown as much? and been as successful as quickly?

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Maybe Im a bit of a wildcard, Im not a fan of the waterfall method, bureaucracy and red tape,
I strike while the iron is hot, while Im passionate (motivated),
I take risks, I jump into unknowns and am willing to be uncomfortable,
I love the agile method, throwing paint on the wall and seeing what sticks, the creative process.

To me this is a startup company and time is of the essence.
Rob can have a fantastic product, which he does, but if no one knows about it than its not worth much.
I stepped up and filled in the missing gaps and did my best to complement my skills to Robs.

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A large risk/downfall of the propose and wait scenario,
someone could propose that they will do X, Y, Z, we pay them, and then they take the money and run,

in these back pay scenarios, we already see that the work is done and the value the work has broughten
(so the person doing the work took on the risk and sanctuary owners didnt take on any risk)

I was willing to take the risk.

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I want everyone to be rewarded for their work. I encourage that we back pay to people who already did work.