The Clone Wars built the Obi-Wan/Anakin brotherhood to the point that Revenge of the Sith feels all the more tragic, and it just wouldn’t be believable if Obi-Wan isn’t thinking about his fallen friends.
Obi-Wan was clearly still haunted 19 years after Order 66 when A New Hope picked up, so it would be downright unnatural if The Clone Wars aren’t on his mind after only eight years.
Flashbacks to his final years in the Jedi Order (even if in the forms of dream sequences or visions) could allow the Obi-Wan series to bring back familiar faces without resurrecting characters or retconning twists.