.. a gain of trust in Coin X would increase the ratio of Coin B/ Coin X, even without a decrease in trust in coin B.)
except the increased trust in coin X would result in proportionally bigger gains for existing holders, considering the market caps, and decreased trust in B would result in proportionally bigger losses in Coin B?
Am i following or on another planet?
Without going into excessive detail, I would caution that it is not possible to make an empirical judgement : there are too many variables, too many participants, and the variations are reflexive (trading markets). It is just the same as predicting daily index and stock movements.