Jamshed wasn't slow when he started. I remember it was ODI series in India. He outbatted everyone including the Indians in what was a low scoring series, scoring at a healthy SR. Still probably remains the most standout performance ive seen from a pakistani batsmen in a series. Even had a lot of maturity to his game unlike umar akmal, much better shot selection. He lost form, and that's when his batting turned snail like. In that indian series he looked genuine class. Did well against Australia then too. He also blamed him trying to lose weight resulting in lost form. Its the reason why management tried to bring him back despite terrible performances, because he genuinely looked really good in his early career. It's hard to believe now, but at the time when he was performing, people were even making the case he was as talented/more talented than umar akmal. Why we even rushed him into tests prematurely, we were desperate to play him.
Haris's injuries weren't his fault. But I don't think Haris really took his fitness seriously either, there's quite a few reports to illustrate that. If you take fitness seriously it probably hampers rehabilitation from injury too.
Maybe it wasn't the reason umar declined. But just another example of a talented player losing his way due to fitness. While you can argue Umar never reached heights due to other reasons, he might still have at least been still in the team as an average player if he had kept his fitness. I guess it's also assuming, but I do kind of feel if umar had a great worth ethic about his fitness, I think it would have lended discipline in other areas, hence he might of been a bit more disciplined in his shots. Maybe overreaching there.
The things Azam is doing is very rare. Azam's even aware of this himself. His average and SR in leagues given he plays middle/lower order is pretty incredible. And he does it being obese, not maximising singles, and his weight also affects his reflexes. And yet he still gets those numbers. Can only imagine how good he'd be if he was actually anywhere close to healthy weight.
Maybe ruined their career is the wrong phrase. Maybe better to say that every single talented player we had either had no integrity and fixed, or didn't care enough about fitness. Or both. Babar is the exception.
I watched the 2012 series. Jamshed played numerous rash shots, as soon as the drinks break ended, the commentators even mentioned that jamshed looked like he wanted to get out every delivery and didn't have the nerves to settle. Multiple times he top edged the delivery but it landed in no man's land.
Average players can score here and their, shehzad has done it multiple times but that doesn't mean I'd bring him back.
Shehzad was ironically more talented then jamshed, dude was a breakout star in BPL and scored a 100 on debut, also was the first pakistani player to score 100 in all formats, but he had issues and he didn't work on them.
Judging a player based of 2 hundreds and then claiming their lack of form due to other bad performances is not an ideal metric.
Haris didn't take his fitness seriously I agree, he was chubby, but fitness and knee injuries are 2 seprate things, Theirs no amount of gym in diet in the world that can fix that, He needed genuine surgery and after surgery couldn't recover fully.
Umar didn't decline, he didnt improve and remained at stage one, scoring a few 100 here and their including a great 100 in 2014 against Afghanistan from a collapsed position doesn't mean he was goated. He had talent but was genuinely stupid when it came to understanding game conditions and field placements.
I'm not denying what you're saying about fitness, but fitness is not what determines a goat player. Steven Smith and root and even most of England atm are beyond fit and healthy, yet their lack of form has nothing to do with fitness.
As for azam Khan disagree in everything you said.