"Why is this manouver sometimes better, than a normal high yoyo?
Does lag displacement roll, sometimes succeed where high yoyo fails? (or would fail)?"
I believe there are two reasons.
One, the high yo-yo is a tighter, more aggressive maneuver; the attacker stays closer to the defender and often has to shoot while diving form up high. It's not that hard to dodge a shot and force an overshoot from such an aggressive attack. The lag displacement roll on the other hand puts the attacker further back, on the defender's six or mid-high six and closing; more time for the attacker to set up a shot, more difficult for the defender to create a tough angle. For that reason, you should probably use the high yo-yo when your target is much faster than you; if you lag-roll against a 109 in your I-16, you probably won't catch him despite your initial energy advantage. If you're in a Yak or LaGG though, you probably will.
The second reason I suspect is that a lag displacement more confusing from the point of view of the defender. A high yo-yo is almost as clear in its intention as a hard break towards the defender's six, but in a lag-roll your attacker pulls up early (maybe he didn't see me?), rolls away (maybe he lost me or is distracted by one of my team-mates?), and additionally all those maneuvers are hard to track from inside the cockpit. In the confusion the defender just keeps flying straight.
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