PDC override full explanation?

Hey all. I'd like a full explanation of what's going on with PDC override if possible. I read the small explanation but it left me a bit baffled. I had two guitar tracks going to a stereo bus with a stereo amp sim on it..the latency started getting a bit unplayable in this project so I tried tracking the second guitar with PDC override enabled. It sounded fine during tracking but on playback the two guitars were very out of sync. Is this because one was being adjusted in some way but one wasn't, and they are going through the same stereo plugin? I also can't understand why, if PDC override is able to get rid of latency on the Echo'd track, why you wouldn't leave it turned on all the time with all your tracks Echo'd to create a latency free tracking situation whilst still hearing all your plugins. I know I'm getting something confused! Thanks for any help

But the PDC Overide is intended for this purpose - I've used it in the past to dub one line it, it disables PDC on monitored tracks and then I'm guessing shifts it by the correct time. I just can't see why if that works, why you wouldn't use it on all tracks all the time.

Containing other data explains why the stereo guitars were going wrong. The actual track I was monitoring didn't, but they were going to the same bus with the latency inducing plugins on. I understand it now. It has always been useful for me for dubbing in during a mix, I was just wondering if it could be even more useful. For example, it's my desire to run an incredibly powerful system with a high sample rate to run very high projects on a low buffer and hopefully retain trackability all the way throughout. Latency inducing plugins are the only setback there.