I'm pretty sure he never made any commercials and/or headlined any events. One would think he would have gotten some deals after last season but he didn't.
Depend. The brand should fit the sportman/artist.
By example:
Daisuke-- Some beer, tell me if knowing Dai´s taste for getting a little drink happy at dinners doesn´t made sense

Amino vittal and some brand of food.
Kanako- Adidas, girl looks beatiful even when ugly crying. ANA, Brother Industries and Otsuka Pharmaceutical
Mao- I think some creams and chocolates Nestle, and some other brands, but she is the most popular sportwoman in Japan so she has a lot
Yuzuru- Monster Hunter (video game for Nintendo Wii U), ANA, and some brand of chocolates and gum,Amino vittal and some brand of food but he is OG so he is hot commodity right now. Also he is young so is easy for brands to pick him.
Takahiko Kozuka- Toyota, where he works
Also is worth notting that all this skaters have something i commun, they starting winning really early. So some sponsors have been with them since a lot of time.
Machida by his own account doesn´t like to be around a lot of people, and would prefer to be in a silent places, wich will made difficult for promoting a brand.
So lets see wich products brands should fit Machida:
Books
I guess food
Maybe wine, he looks like a wine kind of guy, or maybe whishkey
Suits
Cars
Probably brands aproached Machida, or would have approached if he should have choosed to stay another year with good results.