Will almost certainly go the full distance. Close, decision either way, imo. Gun to my head and I'd go for Byrd in a close, close fight.
If this is the late 90s-early 2000s Byrd, he wins clearly. If this is the mid 2000s version of Byrd, he wins by a very controversial decision. Parker is good and we need to wait for his career to be over for a better assessment, but his best wins have come against sluggers (and his worst loss too).