Bunch of questions here.
Last first:
Soreness doesn't affect anything. You can lift with sore muscles and create more damage.
However, I think you need to be clear on what you're trying to accomplish.
Strength and muscle mass can be maintained with a single workout a week, according to Bill Kraemer of UConn. (I'm not sure about the specific studies he's referring to, but I've heard him say it in lectures several times.)
I don't know what happens when you lift less than once a week--I'd assume you'll start losing strength and size quickly if you gained it quickly; if you built up over a longer period of time, I think you'd hold onto it longer.
Endurance exercise won't help you maintain muscle strength, to the best of my knowledge.
But the bigger question is, what are you trying to do right now? I couldn't tell from your post if you're in a transition period in which you're trying to give your body a break from training, or if you've launched into a fat-loss stage.
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