of course. In any event ...
Not having read The Euegenics War novels, I have to ask ... are Rain and Roberta just "cameo," walk-on characters? Or do they have some part to play in the drama that unfolds in your book? Not asking for anything to be "given away," of course, but you did happen to mention it ...
Gary Seven and Roberta are major characters in the EW books, which are pretty much about Seven vs. Khan. Rain, alas, just makes a cameo appearance near the end of the second book.
I've always meant to do more with her, but the right story hasn't come around yet. (There's actually a character in another one of my Trek books, whom I thought about making Rain, but I ended up going in another direction.)