I haven't seen the term sheets, but according to the article (and the one in Inc.) it seems that they jumped in fresh in the Series E, because Tony's investment

I haven't seen the term sheets, but according to the article (and the one in Inc.) it seems that they jumped in fresh in the Series E, because Tony's investment firm basically did all the other rounds. If I am not mistaken, Series E was the first round that outsiders joined. I could be mistaken on that though. However, I am reading his book now so if I find out I will be sure to let you know :)