Story time!
I thought that the coliseum wasn't going to be too hard, so I got the key in Sewer Access immediatly, and entered the arena with my level 10-12 party... To be frank, I was a bit intimidated by how there were enemies from the Giant's Claw in the easy mode fights. I beat the Lizardactyl, and went on to fight the final fight of Easy mode... Masamune-form Spekkio.
My jaw dropped as he did 1800+ damage to my whole party.
Yeah, I think the coliseum is a bit too hard, but I guess that's what makes it so great. I've only beaten Masamune form Spekkio once in as long as I've had CT, which is nearing 6 years now, and that was on my SNES version. I've never even seen the pink Nu formed Spekkio.
Long story short, I won't be winning this competition. But I know I'm enjoying just trying to complete Easy mode. Plus, the arena made me finally start playing the CT Rom I've had for 7 or 8 months now. Up till then, I'd only gotten as far as recruiting Lucca in 600 AD. Now, I'm just past Zenan Bridge, and have put at least half of my playtime of the last two days in the arena alone.