Hello everyone. This is my first time posting. I have been reading these forums for a while and had a thought that I wanted to share. I apologise in advance for the length.
The main idea is that the Adhesion surge does more then just the "full lashing". It, not gravitation, is the primary way that Windrunners fly.
First some analysis of the Adhesion surge itself. I think the name "Adhesion" is very misleading as it is not the "surge of sticking things together" but the "surge of atmospheric pressure". I think that the "full lashing" functions by reducing the air pressure between two things. This would create a vacuum that suction cups the objects together.
Furthermore, I believe that the "reverse lashing" is not an application of Gravitation, but instead of Adhesion. I know that most of the documentation states that "reverse lashing" belongs to Gravitation, but is there a definite WOB on that? If it is just stated in the text of the books/Ars arcanums then it could be incorrect. Mr. Sanderson has stated that the Ars Arcanums are limited to the knowledge of the characters in their respective book, which is why they changed throughout the Mistborn novels. If we remove the assumption that the "Reverse Lashing" needs to be part of "Gravitation", then does anyone else think that it does not mesh well with the rest of the surge? The vast majority of the time when someone uses "Gravitation", it is in the form of the "Basic Lashing", which seems to take an object and make it fall in a direction other then the center of mass of the planet. How would the "Reverse Lashing" fit into this equation? Increasing the gravitational attraction of the applied object? Instead, under Adhesion, the "Reverse Lashing" could function by creating a low-pressure area on one or more sides of an object, turning it into a vacuum cleaner. This is essentially the same as the "Full Lashing" minus the second object.
Finally, I think that there is much more that Adhesion can do. Remember that Adhesion allows the user to control atmospheric pressure. Wind is nothing more then air moving from a high-pressure area to a low-pressure area; This would imply that a sufficiently skilled user could manipulate the pressure of the air around them allowing them to control the winds! On a large enough scale this would allow one to control the weather. On a smaller scale, one could control the winds in their immediate area which would blow around anything light enough.
Conveniently, Windrunners can use gravitation to adjust their weight, thus making them light enough to be blown around! This would imply that Windrunners would have access to a method of flying other then using Gravitation to adjust their falling trajectory. Maybe a quick fall into the sky to take off followed by a nullifying of weight then using Adhesion to go where you want to go. This would explain the name of the order if they literally used the "Wind" to move around quickly or "run".
We have seen a similar concept for flying in Mistborne. This is how the Southerner Scadrian's flying ships work. The crew zeros-out their weight with feruchemy and then uses fans to push the ship where it needs to go.
Now I know that we have only seen flight achieved via Gravitation, but remember that we are only on book 2 of 10 and Kaladin is only halfway developed as a Windrunner. There is no reason why he could not figure this out as he continues to advance. I would like to note that in Kaladin's final duel with Szeth in Words of Radiance he starts out by using Gravitation to fly, but halfway through the battle he specifically tells himself to stop thinking about Gravitation and work on instinct instead. He could have switched from falling to "windrunning" for the remainder of the battle.