why don't you add in these...

You forgot the most important one:

Deinfreund what is that

The Vanquisher model is pretty much two Corsair models smooshed together so I would be reluctant to use it.

Surfboard was in the game relatively recently but was buggy and almost never used.

I've given some thought in the past to using the Lancelet model, and a smaller Kestrel as a bomber drone, but never ended up with a design I liked (also, implementing a bomber drone and ironing out the bugs would require significant work).

why don't the other ones apply?

The ones people haven't yet gone through:

• Spicula: is Nebula's drone so would require Nebula.
• Kestrel: pretty much Raven (single target burst) but does not dive (bad, less interaction with land units).
• Lancelet: AoE is spherical so a kamikaze submarine would be very wonky vs amph units since it would behave differently depending on depth. Maps vary heavily with sea depth but this is fairly hard to discover. Also steps a lot on Claymore toes.