LogFAQs > #971874366

So this match takes place in the Sword & Shield Dungeon (Maze?) from Oracle of Seasons. My team starts at the entrance on the first floor and the other team starts in the treasure room in the basement.

So there's two way this match can go. Either this place magically expands to fit Sahelanthropus, which means that it can go along and fight with the rest of the team and isn't hindered in any way, or Sahelanthropus barely fits, which leads it to just destroying the floor to try to cause a cave in.

In the first scenario, there's nothing anyone can do here to stop Sahelanthropus. Crono thinks he's some sort of immortal viking, so he's going to run in and get himself killed against it. It took the combined forces of Venom Snake's military to down Sahelanthropus. Aigis doesn't even come close to that kind of firepower even with her persona. She can't win this alone.

In the second scenario, Liquid just gets mad that he can't move that he starts trying to wreck the place to make room. He's probably going to have the floor cave in, which isn't good for the other team that's currently below mine. Sahelanthropus has a giant flame whip that it can use to have stalagmites jut out of the ground. There's also a cutscene where Snake thinks he has it trapped behind a cliff, then it just breaks the cliff down to keep chasing Snake. It has the legpower to casually kick tanks around. If it wants to make room, it'll make room. Even if the other team manages to survive the cave-in, they still don't have the firepower to down Sahelanthropus.

TL;DR: Sahelanthropus needs an army to be taken down. Crono thinks he's immortal when he's not, and Aigis doesn't have anywhere near the firepower needed to take down Sahelanthropus by herself. If the terrain is an issue, Sahelanthropus will just destroy it like it has in the past.