Hey it's not as if they wished to be shorter than average. That's not fair
Ahsan/Hendra just teamed up a bit later because Kido bailed out before that. Maybe if they had been paired sooner they would have achieved more. Then again, they were disrupted by Ahsan's back injury too so yeah that's why I don't think he is one of the strongest because of his physicality. But his attacks are definitely most effective to make up for his frailty. Pair it up with Hendra, perfect combination.
Count your lucky stars Kido bailed at all, or else we might have seen a physically inadequate pair trudge along another 2 years or so - Setiawan doesn't seem to be the type to end a partnership because he blames the other player for their lack of results (although he should have, in that one). Just speculation on my part, though, I cant claim to have a lot of insight into his personality at all

But what a fortunate combination of events, both Ahsan and Setiawan being available at the same time, and Hendra willing to return to PBSI...
So who's in your top 10, may I ask ? since 2000's, I would say only cai/fu, kdm/htk, and maybe tony/candra being better than them. maybe lyd/jjs too, but that's it.
Only going back to strictly 2000 seems a bit narrow, I'll consider earlier WC/OG years as well (even though I didnt watch anything live back then, it's still pretty well-documented and roughly comparable).
In no particular order - I'd put KDM/HTK, CY/FHF, LYD/JJS, LYD/YYS, BoMo, MK/HS, Tony/Candra, Sigit/Candra, Kim/Park, Rexy/Ricky above them.
Some of these are obviously debatable, and I haven't gone far back in time (one might put Li YongBo/Tian BingYi above them as well, for example), but personally I think it's very very hard to compare anything before the mid-80s at the earliest to today's badminton, the lack of WC and OG tournaments and overall smaller circuit and lessened competition makes it very subjective (not to mention China wasn't competing in the IBF until 1981), but this is a list based on a mix of preferences and achievements. Ahsan/Hendra are certainly very close to that, probably just outside the Top10 at 11 or 12. I certainly see why someone would put them into their personal Top10, although I dont see a coherent objective argument at this point in time for a objective Top3 spot (yet) or them even being in the GOAT discussion.
If youre only going from 2000 onwards, they're certainly Top10 by almost any criteria.