I think cyber pegasus is stronger than lightning l drago because cyber pegasus has the perfect attack and defensive skills and lightning l drago has only power and attack.

because he payed life of the effect of power bond 4000 cyber end dragon attack points

You can only tribute one "Cyber Dragon" on the field with "Attack Reflector Unit" in order to Special Summon "Cyber Barrier Dragon".

We live inside a complicated computer matrix.

Every attack is cyber terrorism...

Assuming both monsters survive the first attack, yes, Cyber Twin Dragon can declare its second attack against the same monster.

So if the opponent had an attack position Spirit Reaper, you could attack it twice. It would not die, but the opponent would take battle damage to his lifepoints twice.