Maybe I missed something in the game but I have these questions
1: What was the orignal purpose of the tiem egg. Gaspar certainly didn't made it to save chrono only, was it an experiment done because he had time to waste (yea right 
)
2: How does the Chrono trigger/time egg works? it needed to be used on death peak near a tree, why? why does it shatter BEFORE drawing the gang at the exact moment THEY WANTED, not whenever exactly then.
out of topic questions:
3- Why does they need a cloen couldn,t jsut they take crono's out and put some ashes or something?
4- What the hell is the lab in leene square it creates clone in 1000 AD?
1. It was created as a device that can break the laws of phsyics of time. Gasper, seeing how everything is going on with Lavos, guessed something like that may be needed. But Time Eggs can't only revive peple.
2. When enough dream energy is invested into the Time Egg, the egg shatters, releasing that energy, creating a small black hole and rotating it. The ones who invested the energy are then sent into the point in time they desired.
3. Because even if they break the laws of time, they still can't create paradox. Crono HAD to be there.
4. It's a small lab that can create dolls. Their called "clones" because they look exactly like the person in question, and can be placed in any pose.
