Blame the previous PPT for not doing his job properly.
My good man, you had ample opportunity to rectify Spark's mistake when you took over as PPT instead of moving immediately to a final vote without checking whether the previous guy made any mistakes, which given you've been complaining about him for months you should have assumed he did anyway.
I didn't spoil you on this when I left the reins for you back in January, did I? If I ever become PPT again I'll be sure to make more mistakes so you'll be more vigilant about the past PPT's mistakes in future.