Having a live betting strategy, if you know both fighters very well to me makes it far easier to spot a good solid livebet spot.
I´ve not said that I´m the only one who thought of betting DP after round 1. I bet him last time around without any issues.
I´ve found big favorites takes a very long time before they become dogs, even when they should had been a dog long ago. A good example of this is Edmen vs Brunson where Brunson was still around +200 despite Edmen being completely gassed out by the end of round one, having arms up on the cage etc. Even when he started losing it took a while. This may be due to bookies not wanting to change the line, or because a lot of people think they get value now by betting a big fav at much better odds, which can be very deceiving imo.
I don´t think the line on DP will suddenly make him a huge fav. Especially not if he loses the first round. Thats why cardio in livebetting are the best spots, as it seem to always take so long for odds to become fairly accurate.
Betting DP before the fight is definitely an option. As said you could split it and bet some prebet and wait for some for livebet.
From what I´ve seen there simply isn´t enough sharp money to counter a fighter winning a round despite being gassed. Another example of that is Sara Mcmann vs Pena. Mcmann is a notorious gasser, but she pretty much always wins round 1.
If you struggle getting bets in live, then yes definitely I agree bet prebet. But if its not an issue, I like to wait. Of course sometimes you do miss out on a line, or sometimes they don´t even offer livebet if its the early fights, so betting prebet is not a bad idea. Personally I´ll likely livebet this one though depending on how the lines changes.