Your two cents are worth more than many.
1) is a no-brainer. It's too soon for Ansom to die unless Vinny is to become the new "alter-agonist." That would be a pretty dramatic move, however, and would deserve complete focus from the plot. I think too many other things are going on right now for that to get the full effect it deserves.
2) Parson's fault or no, the loss of the three warlords would be a greater disaster than the loss of the dwagons, anyway, and Tool & Co. would be equally screwed no matter who is blamed. If even one warlord survives, however, Parson will still have three warlords to raid the siege engines with in the future, and I think everyone is agreed that the siege must somehow be nullified to prevent the final battle from being a an easy victory for the alliance. Can Parson ride a dwagon into battle himself? Possibly, but if Ansom groups all his siege into one hex with all the air cover there Parson is probably not going to be able to do anything.
3) Wanda becoming resentful is a new idea, I think, which is given a lot of credence in this comic. Interesting. I don't get the impression that Wanda holds grudges, however, and the same seems true for Parson, who seems completely frank and guileless amongst his own company. It may be that Wanda is being irrationally prideful and will take offense at Parson and Sizemore's meddling, but it may also be that she has a secret reason for having so much faith in her control of Jillian Zamussels, one that she is unwilling to explain (not that she needs a reason for that). I don't think it is because she secretly loves Jillian, because she did not hesitate to throw her into harm's way, but--to spin my wild tale again--perhaps Wanda has done something very powerful to Jillian that involves recovering the Arkenpliers for her own--Wanda's--use. I wouldn't bet a whole lot of money on that idea but I like it all the same.