I don't see your connection and I am simply not interested in it.
As for grain exports, it's not the recent small ships that have been sunk that play a role, it has been massive warships like the flagship Moskva, sunk long ago, that played the important role. Sea borne exports are most definitely tied to Ukraine's destruction of Putin's Black Sea fleet as without it Putin was unable to maintain his naval blockade and he was unable to impose conditions as part of the grain deal that was once in place that allowed some export.
Putin, without his Black Sea fleet, was unable to impose any naval based conditions on Ukraine and makes it very much related to Ukraine's sea borne exports.
