This post shows the absurdity of 'author' conventions in scientific research. You and C1 are equals. Your authorship with your data and his analysis indicates that you are co-authors, not 'first' or 'second' authors.
Are there reputable journals in your field which allow for, and encourage, co-authorship?
Agreed! We could certainly submit the paper as a co-first-authored paper, but the problem comes in with the credit that I would get for such a paper on my CV. Whatever we agree to personally, everyone knows that co-first-authors are not given the same amount of credit as first-authors (and if your name is listed second, which mine probably would be), many will not notice or care. So that doesn't quite satisfy me.
Grrr. But it is what it is. I met with CI and his PI yesterday and truthfully I just can't ignore their request. We figured out a good way to use NBD and I think I am going to have to just suck it up and pretty much write the paper for him. Well, I mean, he's going to write it, but I know there is going to be some heavy editing. Thankfully the new way of using NBD is easier for C1 to interpret and describe, so I think that will help.
Actually, part of the conversation with CI and his PI was about how they wanted the Apple Basket data that CII is using, and at that point I just wanted to throw my hands up in the air. You could have used it! But write the damn manuscript first! CII is ready to submit and I'm not going to pull out the data from their paper because CI would prefer to use it (a year after the fact and 1 week before I leave for good)
Sorry. I'm frustrated about the whole situation. This should have been an easy data split, but I guess it isn't