DC is an all-time great, Jones is just the paper to DC's rock
DC is a smart fighter, Romero is smart in the sense that he finds sneaky ways of cheating, but is not really a strategist
Rumble Johnson at 205 looked about as scary a human being as TRT Vitor, which is as scary as a human can get. Yet DC beat him twice by exploiting Rumble's weaknesses
Romero also has exploitable weaknesses. A) he is a powerful striker, but not a super skilled one. That's why he usually gets KOs in later rounds, when his opponents are fatigued and less likely to be able to avoid his explosions
B) He obviously has had some cardio and weight cutting issues in the past
Therefore, there seems to be a fairly clear path to victory for DC. Make the first two rounds gritty and grindy, push Romero against the fence as often as possible and pepper him with short dirty punches and elbows. If you can, take him down and just smother him, literally, so you can get him gasping for air
Then be smart in rounds 3 and after. Look for the explosion, that's all he really has at that point. He's not going to be taking DC down, even trying to engage in grappling can lead to a big depletion of energy. So you only have to worry about those huge bombs
I think DC can get Romero down in the later rounds and choke him out
There is, of course, always the chance that one of the explosions hits and DC goes lights out. That will always be Romero's X-factor. But the smart pick is always DC