In Reply To #16
It is a commonly held logical assumption that he was tesing him. As an opponent of Dracula, he would not kill Dracula's top rival. Although, it is possible he did not know he was facing Trevor Belmont, or who that was. Either way, he doesn't halt the battle, but is completely defeated and falls to the floor.
It has always been my assumption that Alucard's power, like Dracula's, increases over time, as Alucard's power is begotten of Dracula.
Here are some more considerations about Hydro Storm. It actually is pretty potent at lower levels, and I believe it may be moreso at the midway point when Richter starts trying harder. It is all a matter of what "level" Alucard is at, or what armor he is wearing. What armor does Dracula wear? Who knows. In my experience, Hydro Storm is not all that weak.
And so what if Alucard can take more pain? Dracula has many variations, and the ways of his power are mysterious. Hydro Storm wouldn't completely annihilate end-game Dracula in SotN. That's a fairer comparison as it was the same resurrection.
Alucard is kind of badass. If he did fear Richter, he wouldn't show it, but as has been said, there is no reason to assume he should. If anyone should be fearful of Belmont, it is Hector, and in fact, in the first encounter with him, Trevor is nearly invincible against him.
As for tying Castlevania to Stoker's, we shouldn't assume the connection goes any further than explicitly stated. They do not fit. Most obviously, where is Dracula's army in Stoker's? And yeah, Dracula got owned in Stoker's, but only because it was daytime and he was killed in his sleep. How cheap. At least he can exist in sunlight.