Best Bryd could beat the worst Tyson. However, a match between both at their prime would be won by Tyson.
Just putting someone on the canvas a couple of times doesn't guarantee a win; boxing isn't that simple.
Actually Byrd doesn`t have enough power to stop Tyson. But a frustrated and 2000+ version of Tyson could get stopped by just about any HW! So Byrd by TKO 10
Tyson's just all wrong for Byrd. Byrd has trouble with compact punchers if nothing else...hence the Wlad losses and against Ike. Tyson is pure compact.
Prime motivated Chris Byrd could frustrate and outbox a prime but unmotivated Tyson. Prime motivated Tyson probably KO's a prime motivated and prime unmotivated Byrd. Post-prison motivated and unmotivated Tyson loses to Prime motivated and prime unmotivated Byrd. Post-prison motivated and post-prison unmotivated Tyson KO's past prime motivated and past prime unmotivated Byrd.