All these examples are still on the same foot as the landing edge, so I think of it as demonstrating ability to maintain flow as well as control of the edge(s), changing the balance point over the blade by changing body positions, edge changes, or turns -- control of the rhythm of these changes to the music would make it even more difficult but maybe that should be rewarded under the "element matched to musical structure" bullet point.
Some may be more difficult than others, but all are more difficult than just holding the edge for a couple of blade lengths and then taking a step/stroke to the other foot.
Some may be more difficult than others, but all are more difficult than just holding the edge for a couple of blade lengths and then taking a step/stroke to the other foot.