One thing you can assume about the candidates though, at least until they quit the party or at least indicate otherwise, is that they are willing to be associated with that minor party. So the best case scenario is a really good candidate who is slumming it with a party whose leadership is both absorbing and doing external deals with parties that are fundamentally opposed to their own stated principles. And then the worst case scenario is a candidate who is actively opposed to the party's goals, camouflaging themselves in ideals they don't believe in.
To me, being part of the Fusion party right now--given the state of its leadership and decision-making--is a red flag even on a candidate who otherwise seems good.
The problems are much deeper than Victorian preference deals. As noted in the BPPR Fusion review (separate post to the preference deal fiasco), Fusion absorbed two additional parties this election season: the centrist Australian Progressives and right-wing Democracy First.
This is not a Victoria issue, this is the party expanding by absorbing other parties which don't stand for the ideals of the existing sub-parties. If the SA candidates are completely unaware of what Fusion is doing and what parties are actually in the party, that might be even worse than them pragmatically accepting it.