If you invest 1 BTC in category 4, then you get the maximum coins possible, you don't need to join the free giveaway then. But other than that, yes, you would have!
The 2.5BTC anon investments in category4, are they still valid?
Which category would give me the best ROI as things stand now?
Category 2 seems to be the answer.
But if you are willing to invest more, category 4 should be considered.
There are still 30 hrs left, I guess many ppl will invest into category 4 in the last minutes.