One one hand, it's nice to see Sumo not being treated like a fodder style for once.
On the massively larger other hand, we KNOW the ultimate conclusion will be that the established fighters kick the shit out of these Sumo boys. We already saw Susume manhandle an Ozeki, so we know he's lightyears ahead of regular rikishi, and we saw him fail to stack up to Baki and basically get toyed with. And the guys the rikishi s are beating are the LOWEST of low fodder: cocky pro-MMA dudes. So these matches do nothing for hyping them up, and will just look ridiculous once they get one-shotted.
I really don't know what the purpose of this arc is.