I always wondered what Top Gun was when I saw people mention it on here. Now I realize that our league calls it MVP for some reason instead of Top Gun. I suppose that's good because I now have Danger Zone stuck in by head as a result of doing nothing more than reading this thread. But I digress. The OPs original question was can you still be a sandbagger if you're leading your division in Top Gun/MVP points. Yes. One could still pad enough innings to stay in the bracket of SL below their true level giving them opportunities for easy wins.
However, I will say a couple of things. I've been on these forums much longer than I've actually played in the APA. Consequently I was under the impression that sandbagging was omnipresent and made for a horrible experience. I'm pleased to say as of the present that really hasn't been my experience. Sure I'm sure there are some doing it, but in our division at least I don't really remember seeing anyone play against our team that I didn't think was honestly giving the best effort they could. I'm sure it still happens, but it's not as much of a downer as I thought it'd be. As far as myself goes my personality type just doesn't lend itself to sandbagging. When I'm at the table I want to run out every friggin time no matter what and shut out my opponent. Ye olde brain just doesn't operate any other way.