I'll give you 3:
1. It truly is a newbie member of eBay, and FR is removing their bids because he has bad experience with such newbies. Jin has specifically stated in previous auctions that this is exactly what he does.
2. It is the shill account of a genuinely interested buyer curious to see how high he has to bid to beat the currently winning bidder.
3. It is someone with a grudge wreaking havoc.
If he is being nefarious, that sucks, and if there is proof (real proof, not "internet" proof), he should be called out on it, but without real proof, I think it's wholly inappropriate to tarnish his name and reputation.