I approach the game from a more snowball approach: if we get 1 scum flip, the game should open up much more than the extra information a more detailed question gives. And I also think having information that we can act on (I don't know if there's a better term for this).
That depends on the scum that flips, and the interactions they've had. I think flipping Jack at this point is no big worry for hypothetical!scum!Jack's scumbuddies, but if ADK flips cylon-aligned then people who've been following and protecting them look quite suspicious.
I think what you're saying is you'd rather have a small amount of definite information that you can condition other hypotheses on, instead of having more information that you can't use without having to consider a wide range of different but possibly-correlated variables (who to trust, who trusts whom, where different bits of data come from, how they interrelate etc). I lean towards the latter, because in a tough situation, having more information might be the difference between willing and losing, even if it means suffering some more uncertainty in the short term.
If there's 3 scum in the "odd scum" group, I think they just win: we exile in that group, they redirect the exile to the scummiest of them, they flip scum, the other 2 are basically shielded for a while, and then they can exile town until it's too late.
This is only true if we take Dylan's information absolutely at face value. The only reason I can think of for you to trust it implicitly is that you're scum and you know that Dylan is townie, but given that we have a pretty good idea that there is at least one 3p player out there, I don't think even cylon-aligned!you should be trusting not-cylon-aligned players enough to let them totally dictate your behaviour, so I don't really know what's going on there.. it presumably can't actually be the scum-tell it looks like!
Anyway, no, if we get and odd result and there are three on-wagon, I would suggest that continue to play a normal Mafia game, exiling people we have scummy evidence on, or people who fit other suspicions (like your one-cylon-aligned-player-on-the-Jack-wagon thing) etc because we can't let one not-necessarily-trustworthy person dictate our votes.
If there is an odd-number answer and it turns out that there were three scum in the pool, it's possible they can't really afford to nk from inside the pool for fear of making it smaller, which is one reason I'm leaning towards the idea that it should be biggish. If town finds someone in the pool too scummy, we assume it's possible we're in the three-scum state, by which time scum may be some very big scummy fish in a very tiny pond that makes them super-easy for us to pick off. That puts a constraint on scum to have to try to be super-townie, possibly playing and voting against their own interests because the cost of not staying hidden is so high for them all of a sudden, which is something I think town can benefit from.