Seifaiden, why give up on thinking? A lot of the excitement is interpretation and discovering new things about the game that captured our hearts. That's part of why we're here, isn't it?
Red is obviously Magus' castle. Aqua is Ocean Palace location. Yellow is where Lavos hit the planet.
Well, this is just great. How does this relate to the summoning circle?
Well, if it is a compass-like circle, obviously Magus's summoning will have to pinpoint Lavos, correct? Assume that Lavos hit the earth coming from a southeasterly direction, meaning it didn't burrow straight down, but northwest on the map. We can assume this because Crono and the gang were able to re-visit the Tyrano lair, right? If Lavos had gone straight down, he would have been on top of it the whole time. So, let's say that the summoning circle and the Ocean Palace were mystical compasses, pinpointing Lavos' power, with the Palace summoning his energy for the benefit of Zeal, and Magus's circle summoning Lavos himself in order to have vengence.
Also take into account that Magus is from Zeal, and nothing there was simplistic, was it? The emphasis on dreams is but one example of the underlying complexity that is the Ambition of Zeal.
As for the beasts, I have no idea. The Four Horseman idea was pretty cool, to be honest. Lavos is the Apocalypse, is he not? Sure, Magus didn't know what Lavos would do in 1999 A.D., but he knew Lavos destroyed
his world.
...Okay. I'm about burnt out for the moment.