Meh I just wanted to vote for something but I have any evidence on anyone. I don't understand what your concern is.
One of the ways I find evidence of guilt is when people make consistently bad accusatory votes, or when they vote for their own partner and then remove that vote for no reason. By throwing a support vote on someone who doesn't need it and isn't in danger, you accomplish the following things:
1. Not upsetting someone by accusing them (he who makes the most friends get the least lynched...)
2. Not having to give reasons for your accusation (no bad logic to analyze)
3. No accusation pattern to analyze.
But you also make no progress in destroying our foes. Everything about it stinks to me. I am trying to think of reasons why an Undercouncilor would do this, and perhaps with some reasoning it is possible. But it also strikes me as a very odd, and far too "safe" move.
Now, Sprig on the other hand, had several accusers. Supporting him accomplishes something. Good or ill I don't know yet, but if given the choice, I tend to go after whoever I think is making the most timid moves a wolf would make, and I tend to reward the stupid/dangerous moves, because that tends to get them killed anyway.
For Sprig to be a wolf after grabbing for all those items, that takes cojones. And, it warrants a little scrutiny. But he's not afraid of that scrutiny, and I like that.
I don't like timid councilors!

No offense to Winston, who has actually been less timid IMO.