Henra,
The significant separation of the MLG + Wing parts I attribute to 'helicoptering' and underwater 'flying' down of those parts due to the attached Wing elements. Wings work well underwater too, admirably for that matter.
Good model! Ok for the one at South (the one we suppose to be RH MLG)
For this one i imagined the right wing disintegrating, bouncing and being affected by air disturbance just after the impact.
But is a coherent model with the other (the one we suppose to be LH MLG) in presence of the (very light) sea currents?