if he played all the Indian games (2018-2024) in South Africa then only one with 35+ is Kohli I think and you can't equate Kohli's performances to what Jadeja would achieve.
Pant as well, shade above (37)
Then again, Bhuvi Kumar averages 33 (albeit in 2 tests)
Vihari randomly score a 40* in one innings and averages 60 because of it
I see no reason why Jadeja, a far better bat, would struggle for 25 given enough tests to prove himself.
His strength is his ability to play ridiculous knocks here and there but never found his consistency, Jadeja doesn't reslly play that style and the only guy in either team to consistently score in those serieses was Virat Kohli and I think Elgar? regardless, considering even De Villiers could barely hit 35 average in 2018, I can't see Jadeja scoring s lot.
The problem with this approach is that sometimes strange players do strange things (like that one dude who averages 80 or whatever in Australia).
Based on statistics and what we do know, it’s fair to say Jadeja has been fairly consistent throughout conditions, positions and with different types of bowling and pitches - would you agree with that?
I don’t see why this consistent batsman who has been averaging 40+ since 2020 and 45 since 2018 or something is suddenly going to struggle to average 25 in South Africa.
I'm not saying he's going to absolutely blast it out of the park and get multiple centuries - but statistics suggest he'll probably average somewhere between 25-30 given that's on the low end of what he averages even in challenging conditions, generally speaking...probably a meaningful 40-50+ type score here and there.
For the record, here are some other players averaging 30+ with at least 3 tests played:
Ollie Pope (!)
Perera
Dom Sibley (!)
Ben Stokes
Chandimal
Tim Paine (!)
Dhananjaya de Silva
Zak Crawley
Joe Denley
Actually there's quite a few, and I've taken out the likes of Joe Root and Kohli etc.