yea I've got a couple of special Goshis of my own; being only ~5'10" and competing at 220-223lb at the time, I had to play from under; all guys in my weight class were 6'1"+
They just fell harder.
There were a couple of sparkplugs in my club. I'm 5'10 as well, and the short thick guys were deadly.
The tall lanky dudes aren't such a problem. I prefered them since my legs are slow & I seemed to get away with more, already being below their center of gravity. Watching the 6'4 guy practice shoulder and hip throws on the 5'5 guy was hilarious. You could time it with a fucking sundial. The blue belt tall guy had a wicked uchi mata tho. Got my white belt ass a couple times.