Well, the best option would be that the PvP and Campaign data are in sync. The relationship between the two is more complex though. While I have no trouble with it yet, AI changes can impact the Campaign greatly (for better or for worse, if you have noticed in some missions you may have an AI as your co-commander). Not every mission has its own customized AI.
Because I realise that mission designers will have to divert attention away from the rest of Act Two to make changes to Act One. Bug fixing is a good reason for the attention. Balance changes a bit less so. A 10% change in some unit stats can make some missions unplayable. And that would be quite a bit of work for Speeder.
The Mig nerf in Mental Omega 2.0psi and the surviving Nuke Silo comes to mind.
Edited by lovalmidas, 08 January 2017 - 11:26 PM.