Jones is already the best of all-time; if he goes up to HW and, somehow, wins the strap, he'll be miles ahead of anyone in terms of ranking.
I don't think this is the best decision, unless, by some miracle, he develops power he's not even shown at LHW. He gets tagged a lot more these days than in his physical prime, and as great as his chin has been at LHW, the same type of shots landing by Stipe, and definitely N'Gannou, are sending him to the moon.
Can't see how he doesn't approach the aforementioned with extreme caution and take them down immediately. On the ground, he's got every chance of being victorious, but neither of these guys should be getting taken down by him in the first place if they just bide their time.
It'll be amazing if he proves me wrong and either keeps either at bay in the stand-up, or goes up and fights his usual fight - I don't think he has a prayer of trying his 'thing' in mirroring his opponent and beating them at what they're best at at HW. Screams survival tactics and tying up the moment he feels the power and weight of natural HW's trying to take his head off and smashing him with shots that have no measure to what hard-hitting LHW's can muster.
He tweeted about Stipe's weaknesses or openings during the fight, but I bet that's a rouse and he'll go in there attempting something different.
Whatever you think of him (I see the all-time discussions on here where, somehow, Jones is invisible!?!?) he's got the nerve of a true champion - I think he's a sociopath, however, which is a discussion for another time - and really is bold enough to go in there and try and prove doubters like myself wrong.
Jones with 20+lbs on him will be a weird thing to get used to.