When I look down at my rear derailleur, the cage kinda kicks slightly inward toward the wheel. The der. hanger is not bent. It's a fresh build, but the rear der. came off my other bike. I can wiggle the cage back and forth a tad, but the flex/play is not in the mounting bolt. It's in the parallelogram links. (10 month old derailleur)
The main thing that caught my attention was a "micro-chainsuck" incident that didn't really do anything. I was getting into big ring and the middle to outer last few cogs on the cassette. The jockey pulley next to the cassette is lined up just right with the cassette, but the bottom jockey is inward a little bit. So, long story short, the top part of my chain doesn't follow the exact line as the bottom side that is coming off the big ring.
Do I need a new derailleur because top part of the chain is not perfectly vertical to the bottom, or is it normal for the top chainline and the bottom chainline to be slightly different?