They would better fight for a retirement belt then

Dunno how this fight gonna prove that Bones is GOAT and add something to his legacy, but when you are (was) number 1 p4p, beating retired fireman does not give you any point of cool. Winning a guy who hasnt fought almost for 1.5 year, when you are supposed to be best UFC fighter, imho this is not the best way to end career or claim to be someone special.
Bones got injured and gonna return in 8 months (wiki says that). Stepe gonna be almost 42 that time. Dunno what should I expect from that fight. I would better watch Aspinal making his first belt defence against <insert name>.
It almost sounds like it's some sort of Jon's personal ambition rather than anything else, but this ambition is not very ambitious

Stipe's last fight was in March 2021, so already over 2.5 years ago (time flies fast doesn't it). If Jones needs another 8-10 months to recover, there's a risk that fight will have very low interest.
Imo, the best course would be to get Stipe to fight someone else soon (since he's not officially retired) and if he wins, his fight with Jones would at least make some sense. Although, in theory, the original champion (Jones) should be facing an interim champ (Tom) after the recovery.
Imho Dana cant force Bones to fight Aspinall. Neither Bones is willing to fight Aspinall
Imho he seeks for an easy fight, easy money and finish his UFC career. A fight between Stepe and Aspinall also is not what fans would like to watch. I would personally watch his fight against Blaydes, as they have unfinished business. But Blaydes cant have a title fight right now, as he has lost to Pavlovich.