They aren't really the same size. Jones is very long and lanky, Cain is a thick wrestler, plus heavier. I would put my money on Cain, too much chin, too much size, too much pressure.
Jones' people would be fools to consider this. He stands a good chance of putting a very nice undefeated run together at LHW. He'd be a heavy, heavy underdog moving up to fight CV.
Don't think Cain has shown a great chin. But yeah at this stage Cain is too big to powerful and active for Jones. Although I mean Jones could easily walk around at 225 in really good shape. I think one day he is going to end up at HW and will be a beast.
Jones in two years will wreck havok in the LHW and HW weightclass. Tremendous athlete, dynamic striker and very good wrestler. 23 years old, you kiddin me?
Yeah, roughly the same size from floor to roof, but not the same size from wall to wall. Cain would win.