You know, I had an idea that I don't think has been covered yet. How did Gaspar wind up in Vipor Manor to begin with? You see where I'm going with this? I mean, last we seem him in CT< he's stuck at the End of Time. How then did he make his way to the present without the use of the portals or the Epoch? He could have used the bucket, but that would have brought him to 1999 AD, well past the time frame that CC had to have taken place in.
Wouldn't it be possible that some outside force, or perhaps Gaspar himself, moved Gaspar to that time period for a reason? It's obviously not to play such an important role in Serge's Adventure, as he only shows up a couple of times and doesn't really give much in terms of help, though he hints at quite a lot.
If not to avidly help Serge the way he helped Crono, what then was Gaspar doing in Vipor Manor? Considering that the El Nido Archipelago is not where Guardia was located, but a very small part of the Cronoverse, given that it's just a small grouping of islands and that the rest of the world from CT is still outside the Archipelago.
It is my theory that perhaps Gaspar showed up in time to save Crono and Marle, and possibly Lucca and Robo, as well. It would explain why the bodies of Crono and Marle were never found, their disappearance all of a sudden, and why Lucca had time to write Kid a letter before she was killed by Lynx. If you bring Norstein Bekkler into the picture, it makes even more sense, because he could have contributed Lucca and Robo clones to help save them. The reason why they didn't use Crono and Marle clones similarly could probably be contributed to lack of time. Porre had to have struck unexpectedly to raze Guardia Castle like that and still have Guardia being a prominent force in the world. Which, in turn, would mean that Crono and Marle had to be on the fly, quick, probably gave a quick tip to Lucca and Robo and before being sent off by Gaspar for whatever reason; probably to prepare for Dalton and once Lucca and Robo did the switch, they dipped, too.
If Gaspar was involved, it would mean that at least Lucca and Robo knew that Lynx was coming for them specifically, at the head of the Porre Military, which is corroborated by Lucca's letter because why would she write such a letter to Kid unless she knew she was going to be taken out of Kid's life? And if she knew, why stick around to be killed; especially if you've been informed by the Guru of Time that you will die if you stay to fight. If they knew Lynx was coming for them, it would make even more sense that they disappear unexpectedly.
While it probably wouldn't have minimalized casualties in any way for the Guardia forces, it does give Crono and Co. time to prepare for a much bigger fight than the one they left on.
it makes perfect sense, because Gaspar probably also would have known about Serge already, and Kid and knew they could handle the events of CC without the CT crew.
Can I haz cookie?