I wonder if eventually you might contrive a clever 50:22 (say a diagonal grubber kick from the half way to the 22) complete with a teammate placed forward, motionless until the ball goes into touch , but then well placed to dart forward and take a QTI
(Step forward coach didds to tell me I am overthinking it and something that complex would never work in real life and it would be a waste of time to practice it)
But that's just not (kick) tennis is it!
But to consider your ever changing scenarios:
If the thrower is ahead of the kicker they are offside, even if motionless, even if injured or feigning injury or even playing dead, perhaps not if dead. But you'd likely stop play if there was any concern about a motionless player so QTI would revert to TI after stoppage.
Can a QTI be taken by an offside player, I would offer no.
Does the ball going into touch play them onside doesn't seem to comment but as the ball is dead then offside lines would be reset based upon the restart. However advancing in front of the kicker, or another onside player, before the ball goes dead is considered offside. Assuming the ball will go into touch is false as the wind, the tree, the dog, sleeping or otherwise, may all affect the outcome and the ball remains on the field of play and live. So the only option really is to call the offside player to stop, if they do, any thought about advantage and QTI would not arise and if they don't you have grounds to sanction.
If they leave the field of play to sneak up the touchline did they ask and can you ping them for not asking to rejoin?
So the exemplary skill of being able to execute the kick does not necessarily lead to any tactical advantage, perceived or otherwise.
Anyway back to
kick tennis can anyone explain the tactical advantage that they perceive is achieved by participating and prolonging this tedium?
@Stu10 ?