This is all interesting.
On the Address and What Pros Do
There's a lot of variety in how pros line up their shots, and it looks like most of them use different address tricks or practice swings at different times. I'm coarsely splitting these into mechanics vs. visualization (of the line) - heavy addresses
Mechanics-heavy addresses:
Looks like SW22 will visualize a line and the slash through the hit while planted closed:
What's Simon doing here? Looks like pantomiming his walkup and swinging/slashing in swing posture through his hit point. Doesn't look like standing at the top of the pad open holding the disc at the angle:
Looks like Mason is loading his shift and swing very aggressively:
Visualization-heavy addresses:
Here's one where Simon does something
similar to what Josh mentions.
Sometimes SW22 will
visualize more open to target. Notice he's in the woods trying to finesse a Comet to the basket whereas before he was in the open.
Hybrids
Lots of them out there.
E.g. Here's Paul mixing a bit of both (open stance visualizing while slashing through a hitpoint).
Here's Simon planting open
but with a little bit more slash through than his "visualizing" one above.
When should you do which?
I dunno, but this made me realize that without thinking about it, I now tend to do things more like the visualization-heavy addresses when it's a slightly touchier shot or very comfortable line. I tend to do the mechanics-heavy addresses especially when I'm doing something like a power hyzerflip in a tunnel where I really need to know where my release point is and where my plant should land. I also do it if I want to mash on something in the open so I increase the chances that I get a clean power stroke.
If my release point feels dodgy during a round it really helps to first visualize open to the target, then slow down and move more like Simon or Mason and try to feel out the shift and release point. I do that more often when I'm playing solo or with one other person and it shows up on my scorecard.