Well considering next chapter is going to be 45 pages long I would be surprised if he didn't make an appearance. And even if he doesn't show up it's safe to assume we're going to know which road he actually took as in the next chapter Mest is going to play an important role. If we know that Mest took the safe road, then Gray needs to fight Levy, if Mest is fighting Levy, we know Gray has the safe road and if Mest fights Gray he surely makes an appearance.
It's actually 65 pages.It would be lame if Mest, whoever he faces, doesn't make it to the next round. What's the use of introducing a new character that's just going to get eliminated so quickly? Also he's supposed to be the strongest of all 8.