I think other questions are the degree of asymmetry, the period of time this asymmetry persists and the trend (does the asymmetry increase or might it bounce back).
As we don’t have agreed thresholds, we are bound to our discretion.
Would you say in the current situation a withdrawal of 10,000 NBT from @zoro’s gateway account at Poloniex to FLOT NBT makes sense (I do)?
After FLOT agreed and zoro withdrew the funds, FLOT should deposit BTC to zoro’s account.