I disagree, rolling is not leaving the trail, sending is leaving the trail and can be used because occasionally jump is inappropriate, such as on a drop. But it is a bit semantic. In this case, Nuno's line seemed fastest which was to get more distance than others and land on the grass after the rock landing which wasn't as flat a landing.
This is getting a lot off topic, but I think you're really thinking of table-tops etc. in DH where squashing the jump and getting back on the track is always going to be quicker. Its not the same in XC where there's usually a couple of landing options and definitely not the same with drops, where there can be several choices of landing point that might change how something is handled depending on race, speed, conditions etc.
Also, in this case I'm not sure it really matters much. The difference between a longer landing, the shorter landing and rolling it looked to be very small, there was enough run off that lost momentum was going to be small and there wasn't enough room that you'd get overtaken by people for picking the wrong option (unless you tried to roll something that wasn't there...). I've heard the b-line was 7 seconds slower which would have made a big difference, but I'm not sure anyone used it.