IMO Akiyama still has great potential, there are just a few problem obstacles though he'll have to overcome.
1. HPA - No discussion needed
2. Warped wall - once again, no discussion needed, dude is short.
3. Slider Jump - New obstacle which even Nagnao failed, also his eyesight could hurt him here.
4. Downhill Jump - Where is the rope?
5. Metal Spin - Where is the ropes?
6. SCH - Where is the ledge?
If you need me to go into any further details, tell me.
Besides that I think he's a strong competitor, stage 3 IMO would be pretty easy for him. He definately has the strength to do it, I mean, he's ALWAYS gotten far into stage 3 except hsi failure on the body prop.
I think that would be one of the easier stages for a guy built like akiyama, an even though it's night time his bad vision shouldn't hurt him on really any of the obstacle, and stage 3 has some good lighting.
And final stage, well granted he does the ladder well he's a beast when it comes to climbing rope.