"Only X" weapons

[StarBaseSweeper]

However, the damage not used BY a only X wepaon does not count as remaining damage right?
I mean that if I have 2 Only Weapon weapons it would not destroy anything like below:

Comp... Struc. Dam.
Bridge . 10 ... 0
Crew Q . 10 ... 0
Life S . 10 ... 0
Weapon . 10 ... 0
Engine . 10 ... 0

... Type ..... Damage
1- Only Weapon 6

Comp... Struc. Dam.
Bridge . 10 ... 0
Crew Q . 10 ... 0
Life S . 10 ... 0
Weapon . 10 ... 0 (6 not enough to destroy)
Engine . 10 ... 0

... Type ..... Damage
2- Weapon Only 6

Comp... Struc. Dam.
Bridge . 10 ... 0
Crew Q . 10 ... 0
Life S . 10 ... 0
Weapon . 10 ... 0 (6 not enough to destroy)
Engine . 10 ... 0

Am I right or still not understanding correctly?
I am trying to see how much the geltube or adamant "leaking" armor ease the use of "Only X" weapons. Indeed if a ship has a big "leakage" armor, then it would be easy to destroy a lot of engine by Only Engine weapon, using let say 2/3 normal damage weapon, just not enough to destroy a "leakage" armor, and then the "Engine Only" weapon.

Am I understanding correctly?