Not sure.
Dennis does not seem to play with the same confidence and killer instinct he once did. The old Dennis was a feared player who intimidated his opponents and never seemed to show any sense of nerves.
Recently Dennis does not look like the old stone cold killer he once was. He shows a lot of emotion, gets down on himself fairly easy, and his negativity shows weakness to his opponents and they attack it. Dennis can still play awesome and can still outrun his opponents more often than not, but he is certainly now seen as beatable and no longer has that ability to intimidate players he once did.
I think the last few encounters with SVB reaching all the way back to TAR have nearly neutered Dennis when it comes to him having to play SVB. He comes into matches with SVB looking like he already expects to lose, he looks nervous, little things bug him early in matches, and he folds like a kite. I would say SVB is a fairly strong favorite in a match with Dennis at this point, not just because SVB plays so good, but because Dennis simply does not seem to believe he can play at SVB's level anymore and goes into matches thinking he is a clear underdog who needs to pull off an upset. That is a tough spot to be in, especially when you "used" to be the most feared player on the planet.
TBH, I think Dennis O from 5 years ago would spot the Dennis of today the 8-ball in an ahead set of 10-ball, and he would win easily. The reason for that is not shooting ability, it is simply the mental game and the fact that I think Dennis O from 5 years ago was a far stronger player mentally than the Dennis O we are seeing today.