Good to have you back and you came with a banger.

Like I said earlier, mating between two different species is not actually the issue, the issue is that often times, the mating results in no fertilization or formation of infertile offsprings and that only cases of mating between two closely related species can result in production of fertile offsprings.

In order to answer the question above, three events are possible if the sperm and egg of different species meet;

No fertilization
Fertilization, but resulting offspring becomes sterile
Fertilization and resulting offspring normal.

That was the highlight of your post and it just hit the nail on its head. I enjoyed every bit of this article

I will also like to add that the enzyme which is present on the acrosome cap of a sperm cell is “hyaluronidase” and enables it penetrate the ovum as youve stated 😀