My statement doesn't say or imply that either. The statement says "Penetration given the same bullet is caused by how much velocity it strikes the target with." Note the words "Penetration is caused" and "how much". "Penetration is caused" does not necessarily mean "more penetration" and "how much velocity" does not necessarily mean greater velocity.
It is rather obvious that as a bullet expands and deforms it has greater resistance within the target which has a negative impact on penetration.
Depends on the bullet. A mono that impacts at high velocity often shears its petals off, which provides for very deep penetrqtion.
