Monday's hot topics - Darby the Calvinist?

Matt Cook posted some interesting findings on Darby on the forum - here:

just happened upon a neat little letter written by everyone's hero, JND. Here are some neat quotes that grabbed my attention: "To leave him to his free choice, now that he is disposed to do evil, would be a cruelty. "

I've heard from a few sources that Darby was a Calvinist, so if he leaned that way why are the Brethren generally opposed to Calvinism?

Hmmm...why are the brethren generally opposed to Calvinism if one of the main founders of the movement was a Calvinist?