Every variation?

Would it be worthwhile from a fitness point of view to learn every variation of the FSP? And if so, how far along the line should one be with one variation before starting work on another?

For example a planche can be performed at a number of hand angles which each correspond with a deltoid muscle. If an athlete could hold a proper planche with his fingers pointing backwards I assume that unless he trains seperately he cant perform a planche with his fingers facing any other way. If he did learn to do it with his fingers facing elsewhere he could improve the strength of another part of his shoulder, and do more of the same for his back and whatever else he is using.

IMO it would probably be best to at least be proficient with a full planche before starting to change the angle of the hands so that a workout would not slaughter his upper back, and not last to long for comfort/health. But that is just my educated guess (I'm still struggling for 3x5s tuck planche, and the remainder in a back lever with similar finger angle).

What are your opinions?

If you keep your elbows locked the shoulder position will be more or less the same since you're just rotating your forearm to change the hand position. On the other hand if what i just said was wrong and you do involve other parts of the shoulder i still dont think it would be worth it in any way.

Well turning the hand 180 degrees turns my shoulder just under 90, which must transfer some weight between various shoulder muscles, but I think you're right in it being a bit pointless because different muscles can be used in different variations of other positions and once on the rings its probably all the same anyway .

Thanks for the response.