This is an interesting bout and I can only see one way for it to end; Couture with his hand raised. I think that Toney is just way too old and his cardio is just in a way worse condition than Couture's is. He's never fought of his back, with this in mind, Couture's strong point is his wrestling and ground and pound.
The two touch gloves and couture goes for a double leg takedown. He gets the take down and moves into sideguard where he will ground and pound Toney with knees and elbows. He will then move into mount where he will try to get a TKO but Toney will roll onto his back. Couture will then go for a rear-naked that he will get to make Toney tap out or it may be too late and the fight will go into the second round. If the fight goes into the second, Couture will get a quick TKO victory on the ground.
My prediction may seem a little lopsided and farfetched, but if your watching the event - don't forget I said it. I'm just interested to see what match-up the Dana White will give to Toney if he DOES win. My odds are 8/10 to Couture.