I wanna say something about Dr. Seward...
He has a single very important role in this novel, and that is Observer. He is extremely good at fine details, noticing behaviors and patterns, especially when those behaviors are aberrant in some way, and he is diligent about recording all those details precisely.
Things Seward has Observed
- Renfield's "love of animals"
- Renfield's changes in behavior / uncharacteristic reactions
- Renfield's day-night cycle under Dracula's influencefellow's.
- The fact that Lucy clearly knows her mother is unwell
- Batcula, behaving in a way unusual for natural bats
- Van Helsing behaving uncharacteristically
- Lucy's embarrassment on his behalf
- Lucy's bite marks
- Lucy's teeth
- Quincey holding back tears by exceptional manhood
- The sudden disappearance of Lucy's bite marks
- Lucy's wake-sleep cycle with the garlic
And as the book goes on he's going to be the one person to consistently notice / observe changes or uncharacteristic behavior in his fellows. Observing and Noticing is something he is extremely good at.
He has functionally no capacity to draw conclusions from his observations. Here are the thrilling conclusions to his observations.
- *Observing Renfield working his way up the food chain* I'm having a thought! ~twelve days of cogitation later~ My thought is that he's might be working his way up the food chain! If only there were some way to test it...
- *hearing van Helsing tell Lucy "we will send him out to smoke the cigarette"* ...I took the hint and left"
- *seeing Renfield come at him with a knife* "he seemed dangerous"
We make fun of him, but he's not stupid. It's just that assembling the pieces and putting them together are two different skills and Jack has exactly one of them.
(And this is consistent with the notion that Jack might be autistic. The thing he struggles with is drawing connections. But patterns and deviations from patterns he is very VERY good at)
And this really stands out in his interaction with Quincey because Quincey is excellent at drawing connections. As well he should be - he's a storyteller, and what is a story but putting together pieces? He doesn't magically know it's a vampire attack, but he connects Lucy's situation to the situation with his horse. He connects his transfusion to the others and correctly deduces that they've given transfusions as well.
It's like each of our heroes is a stand in for a different part of the Scientific Process. Van Helsing is Research, Seward is Observation, Quincey is Synthesis, Arthur is the Bibliography - getting all the sources together.
And there's an already hinted synergy between Jack's role and Mina's role in that they stand in for the difference between Data and Information, structured vs unstructured data perhaps
But I think the point is that these people have incredible skills but they're useless alone. They need to be put together to do anything. Jack is never going to draw the correct conclusions because his skill and his role is Observation untainted by analysis. The analysis will have to be done by someone else, but the observation is a crucial first step in that process