Forum:Rulings quetions

we are new in dueling and we aren't quite sure about some certain rulings...

1. I activate "monster destroying" cards (i.e. sakuretsu, lighting vortex,etc.) I destroy a "Dragunity Monster" equipped with "Dragunity Aklys". opponent says: Aklys' effet activates but I say no.. who's right?

2. I say:when a ?ATK/?DEF monster is flipped face down, SP'd from the grave... It will have 0ATK/0DEF and not the ATK/DEF they gained...true?

3. I say:when "Stardust Dragon" is "Creature Swapped" and it's negating effect activates, it SP's to the original owner's field on the end phase..True?

4. do you miss timing on "Sangan"'s effect if it is used as a Synchro Material Monster?, because the summoning comes first and "Sangan" being sent to the grave was not the last "event" to happpen.?.both of us aren't sure..so what?..