Alright, i've been following this thread for since the start and i only have one thing to say.
Maybe Finn did see Gradier or some other program like it, but doesn't remember
On the other hand, maybe he didn't. The point is that either way it doesn't really matter because, like you say, most people on this forum know about gradier, so they'll know that it's been done before (although not in this way) and know that the Gradier team can do it as well as Finn.
Now that i've done the totally impartial bit i'll say this: If an idea isn't copyrighted, can it truly be stolen?
Someone thought of putting a timer in an oven, now hundreds of ovens have timers, yet none of them are stealing ideas
EDIT: And since it's open source, the boon of programming, I don't really see what harm is being done, no matter how you think about it. Gradier was the original and has been reborn in a new form and a different name, from a different family, yet the original still continues to grow and flourish.