Liston had trouble with movement and problem landing his KO punch on fighters that used lots of movement and speed. Conn and Tunney were known for their movement and speed. How much trouble with these lighter men would Liston have?
https://www.boxingforum24.com/threads/sonny-liston-vs-gene-tunney-15-rounds.190260/ https://www.boxingforum24.com/threads/gene-tunney-vs-liston.365678/ https://www.boxingforum24.com/threads/tunney-vs-liston-dempsey-vs-liston.278384/ https://www.boxingforum24.com/threads/sonny-liston-vs-gene-tunney.559799/ https://www.boxingforum24.com/threads/sonny-liston-vs-gene-tunney.7923/ https://www.boxingforum24.com/threads/billy-conn-vs-sonny-liston.293609/
Both fights are too much risk for too little reward for Liston if I were him I’d leave them be. Either could absolutely win & I’d stop only narrowly short of favouring Tunney.