Some things I always like addressing.
"The first fight was great."
Cool, then rewatch it. Book something else. For real though, we've rebooted exciting fights a LOT of times and they don't come back exciting. Stop trying to recapture things that have already been captured. A rematch has a much chance to be exciting as any other match because it is just another match.
"The fight was close."
It had a definitive finish. Close don't matter.
"Glover was winning/would have won"
Again, he got finished, and he only would have won if you assume the round Jiri didn't get the finish in also wouldn't have won the round. That's a lot of assumption to make. Otherwise, Glover didn't and wouldn't have won.
"If it went to the cards then.."
So you're erasing the finish? If you mulligan this, that's basically what you're doing. How many thousands of fights don't get run back? Stop making the qualifications for some fights and their results/consequences wildly different from most other fights. The guy won a title, now you're trying to make it not so. You don't have to beat anyone twice to move up the rankings, you shouldn't have to beat someone twice to become champ. This isn't the WWE during its worst era or far-corrupted boxing