I dunno maybe im naive but I just dont see the point at all in them ever boxing.
Roy Jones has done nothing but practice punching and head movement since he was a teenager. He is a world class puncher, KO'd many many guys.
Anderson Silva practices punching obviously but also knees, kicks, elbows, subs, TD, clinch, etc he is NOT a world class puncher by professional boxing standards by any means. No way in hell he could out-box Roy Jones.
If they fought MMA Silva best take it to the ground where he could win easily .....he wouldn't want to keep it standing and eat a combo from Jones with 4oz gloves on. Jones can clinch and dirty box as well if necessary.