So while watching some of the lower division matches I was doing some browsing and came across this wrestler. Apparently Takanoyama is not the first to ever have success as a lightweight wrestler. Ishinriki weighed just 81 kg or 178 pounds. He was a pretty decent wrestler for his size. Came across this video.
He never reached higher than Juryo 1 in his career, but wrestled well there, but size was always a factor. His career totals are:
Wins : 390 Losses : 372