Yeah, it's your fault. Sorry to be so blunt, but you asked. You made your decision, but when J starting b1tching you began to doubt your decision and starting looking for ways to get him in. Basically, you were telling him if the other guys game is off, you will J play,,,,what ?? Put a good player against the other team weak guy and take the win.
So, it looked like you were caving, and J decided he will make it official by setting,up the game, you left too much slack in the rope, and he tightned it. You are the captain, and you could have told the other captain I will let you know my decision, and J is not making the call....
I thought it was beyond silly that you thought you had to play the other guy first before making a decision?? Apologize to your team for letting them down, and tell J he is off the team next time he does not step off when he is told he is not playing.