Given that the evidence so far has either been conceded or unanswered by you, I'd say "isn't" is a lot closer to the current state of affairs than "null". Of course, you will never admit that, so I'll take a "shaddap". I have no doubt that you'll sit on this for a while and then trot out, "youses never proved it wasn't bloated!" at some point in the future, so I'm calling pre-foul now so it doesn't happen.