You are all so complicated. The turn player declares that he or she has ended his/her turn and End phase begins. The End phase is still part of the turn players full turn, this is the point when he or she has to discard cards from his or her hand if he/she has 7 or more cards (this is when the Force Requisition technique can be used to decimate your opponents hand), however any cards (trap or spell level 2 cards) that are set that same turn cannot be activated b/c those cards have not been set for one full turn yet (any cards set the previous turn can be activated). The non-turn player can activate traps and spell level 2 cards at this point.
eg: Player one sets
Raigeki Break and ends turn
Player two sets a monster and sets Comp Evac Device and ends turn
during end phase of player two's turn, player one can activate his/her
Raigeki Break to destroy player two's monster however player 2 has already entered end phase and cannot do anything else. Player 2 cannot activate CED either b/c he or she just set the card down that turn.
I thinks is is easy to understand