i hope there are good news about Bitfinex, for the sake of all those people having their money there still.
but the reason for this gap becoming smaller can be because people ran out of fiat there! you know there is no possibility for depositing money there so the buy pressure is lowered as majority of users bought bitcoin and made their exit.
Yes, that may be the reason, it could be interesting to look at the volume of transactions to check if it has declined. It´s also normal that the difference, at a certain point, tends to be lower. Anyway it´s clear that an announcement favorable to the users of the platform would be positive, for them and in general for everyone because people wouldn´t lose the confidence of depositing money in the exchanges to trade.
according to bitcoinwisdom.com the trading volume of bitfinex has been 11,737 (i think the unit is BTC but not sure!)
and compared to bitstamp which is 8,720 it shows a bigger volume.
also again according to bitcoinwisdom, the volume has been the same yesterday at 17K and the day before 16.7K then 22.3 then 8.5
and what i see is not a decrease in volume so there must be other reasons.